If it has to be an Eventide, you’ll probably get the best bang for the buck from the Space, because it has the ModEchoVerb algorithm which combines modulation, echo (delay), and reverb, as well as the other algorithms for more cosmic sounds. There’s also another algorithm that will give you a tremolo effect, and yet another that includes distortion. So it’s kind of like a multieffects box.
Actually, there is yet another Eventide you might want to look at - the H9. It’s not for everybody, but maybe it’s for you? It’ll let you pick and choose from the effects algorithms on the Space, Timefactor, ModFactor, and PitchFactor - you pay accordingly. Eventide messed up the initial marketing by playing up the IOS side so much that people thought you need an iPad to use it (actually, you don’t!) and it scared some away.