I used to use EchoBoy but switched to ColourCopy a while back, find it way more responsive and smooth to tweak.
Don’t know if still interested, but the Objeq Delay is now free with any purchase on Pluginboutique…
Wavesfactory Echo Cat is the best itb delay, I have tried 
Agreed for Valhalladelay, so easy to use WYSIWYG
Also Echoboy although old, has immense potential with the “styles” menu, where you have peculiar aspects from iconic gear modelled/sampled and with the saturation intensity gives you very different results from one style to another.
I have spent much of a certain lockdown era, can’t remember the year though, starts with 20 and ends with it, trying out all my VST delays, as well as my hardware (7 delay pedals, Eventide H9 & H3500, Lexicon PCM81, Alesis Quadraverb GT) on saxophone.
The two aforementioned remain in the top, but an insanely great addition is Fuse Audio Labs Bucket-500, I have a few BBD pedals and Fuse did an amzing job, it is not meant to be an ultraversatile delay like the others, but it gives instant vibe and never sounds bad, just more in one zone of sound.
Another one I have been perusing, although I had it for some time but never really took the time to properly give it a try is AudioThing’s OuterSpace
Space-Echo tribute let’s say, as it goes way beyond the original and has tons of character.
Finally, 3 really nice ones I found
1)Audiority PlexiTape to be oozing character as well in its own way
2)Pulsar Echo Rec yet another flavour that sounds great
3)Audio Damage Dubstation 2 that is a sleeper one that is perhaps the easiest of them all to use, very low cpu and the most affordable
Colour Copy from U-he sounds gorgeous, bought it from day 1, but I don’t like the workflow as the timing sliders with the subdivisions confuse me, but that’s personal
Best
JzK
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Some “not too common” variants I use and like a lot. They just emulations of vintage / hardware effects:
Echorec “drum echo” emulations:
Lexicon PCM42:
This one is super nice with the deep modulation options and it sounds very good!
PSP have more delays, haven’t tried them but they should be interesting as well.
Native Lexicon plugins sounds very good:
Finally, Eventide Ultratap and Crystals are killer:
Don’t forget your DAW already have some kind of delay and maybe it’s also suppa good one : )
I’ve come to realise that the stock Echo plugin from Live 10 is perhaps my favourite delay! I have the Valhalla Delay which is gorgeous but for a delay which allows for quick rhythmic variation, a tasty feedback and has a built-in reverb the Echo is hard to beat.
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Updated from 9 to live 11 a few weeks ago, and I am totally in love with it too! It is so, so right
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Tom Erbe (of Make Noise Erbe Verb, Morphagene, Telharmonic, Echophon etc fame) has a bunch of plugins on his site including free ones (amongst which is a delay or 2)
https://www.soundhack.com/freeware/
Also I would echo (sorry) the sentiments of others re: Live’s delay (might be worth having a look for presets and Live racks too, of which there are many) and also the currently very generously 30% off Bokeh from Fors.
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Another vote for Valhalla Supermassive AND the paid for Delay.
Ableton’s Echo and Spectral are pretty good too. I have For Bokeh as well, which is can be useful, but less for the super spaced ambient stuff.
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Arturia : 3 Delays You’ll Actually Use
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I use the free Valhalla Freq Echo and it does pretty good for my needs. I’ll have to pickup Valhalla Delay when it goes on sale.
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along w/fabfilter, valhalla, soundtoys, eventide, unfiltered audio sandman pro … i’ll add K-devices TTAP. does some nice slippery things w/stereo movement and shaping. it’s not your bread and butter delay though is really fast to get around on and often it can do a lot of things once some thought is put into it and user gets familiarized.
HY-plugins delay4 is also great.
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+1 for Colour Copy.
Here's something I did as a bit of a demo around the time of its release.
https://www.youtube.com/watch?v=OPl_eucnEC0
Aside from the drums, there’s no samples here. Just a few synths and a handful of instances of Colour Copy paired with loads of modulation. 
– first bit of CC appears around 17 seconds and doesn’t stop til the video does.
apart from his free plugins (which have always been free), Valhalla doesn’t do sales. They’re well priced, though.
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Soundtoys Echoboy Jr and Sr are great for sure. Always using them. What I miss, is the option to add oise on tape delay emulations and ofcourse the option of spring reverb.
Native Instruments Guitarrig Tapedelay has it: noise, saturiation, spring reverb. From the GUI I would say it emulates the Roland Space Echo and to my ears it does it well.
U-He Satin is also good to add some noise to delays.
Replika XT is an affordable swiss army knife of an effect with huge amount of pre-sets.
If you have Reaktor there is an incredible Space Echo ensemble in the user library. Map the time and feedback controls to two dials on a MIDI controller and you’ve got insane amounts of fun for days
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I love the D16 / Slate Digital Repeater delay. Sounds quite organic to me and just feels right in my mixes.
No mention of Fabfilter’s new Timeless 3?
I love Fabfilter plugins and this looks and sounds amazing! Plus we get a new Dan Worrall demo video
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And if anyone catched the “lite” Replika as a gift few years ago, you can upgrade to full version this month for 14,5 EUR…
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