JV1080 or 2080 really is hard to beat for the price. I love my 1080 and they’re the best selling synth of all time so the spply is going to outstrip the demand for a long time yet. They’re a steal (but some of the expansion cards are pretty expensive these days).
If you want something cheap and a little off the beaten path, an Alesis S4 could be a good option, too (I’d avoid the s4+ though, the main “improvement” is they replaced 8mb of excellent for the era piano samples with a GM sound set). QSR is more advanced but has a terrible UI, the s4 is really easy to edit. I’ve only owned an s4+ and QSR but I’ve heard the S4+ is slightly dirtier sounding than the S4; the QSR is noticeably more hi-fi but you’d need to use a software editor to really use it to its fullest, it makes the D-110 and Wavestation SR look user friendly.
Speaking of D110, a D550 would be really nice, too. I’d love to have one of those.
Also don’t overlook the late 90s and early 2000s samplers, especially Akai (IMO). A sampler is basically a ROMpler that can sample. There are a ton of sample libraries available for the Akais too and they’re fairly cheap and easy to learn. I got an S5000 with most of the expansions (no USB and no effects, but all of the voice and i/o cards) for a couple hundred about a year and a half ago and it’s fantastic, especially after swapping the floppy drive for an SD reader and loading a couple gigs of samples onto it. There are other samplers of that era that go deeper into sound design and synthesis areas (EMU, Yamaha, Roland) but the Akais have a great workflow. An s3000 or s3200 could be a good choice, too.
I love the TG33 and K1 but they’re kind of niche things, especially the K1 (which is fun to program and can make some really exotic sounds, but it’s definitely not a normal ROMpler by any stretch - it’s quasi-additive synthesis using a bunch of single cycle waveforms with pitch and amplitude modulation - there aren’t even filters in it).
I got a free D-110 a few years ago and I like it butit is a hassle to edit if you don’t have the programmer, even if you get on well with 90s buttony interfaces like I do.
Personally I’d say JV1080 or a vintage sampler.