But yeah, I'd so go for the SH-2 for that price. There's something about all those early SH's that I can't get enough of. There's going to plenty MS-20minis at second hand (read: not vintage) prices soon enough.
I strongly concur with Dr Phibes:
I'm blessed to have both a vintage SH-02 (and several others SH-xx original Rolands) AND a mini MS-20 (btw I have an original MS-20 too... one of the first batch's one, bought when it was out in France, was 28 then, blyme
anyway, the original Roland sound can't be rivaled (smooth and fat bass plus very moogish leads thanks to a very fast filter/adsr combination), but the MS20 is unequaled when you want to jiggle with sounds and experiment with patching... plus, the Korg filter has a very special sound which is a perfect complement to the original Roland one.
Another piece of advice: Except that the mini has a much better s/n ratio, there's no audible difference btw the vintage and the new one. Of course, you need to get used to the mini keyboard...
as for Roland, the "new" ones (like the SH-01 Gaia) are fun but, on the sound side, they sadly have nothing to do with their older bros of 70s' yore (I know it: I have a Gaia!).
PS: for those who own a rs-09: gr8 organ/string machine... used it a lot in the 70s-early 80s (was muche lighter and easier to carry on tour than the Korg 1000 and 2000). Sold it and bought recently a mkII one (not so pretty, I liked the "old touch" knobs and switches). At least, the sound is no different.
But for a "real" vintage string machine/poly synth touch, with a more comfortable keyboard, there's nothing better than the Korg Poly ensemble and orchestra (btw, the first paraphonic then polyphonic keyboard synths... even before the multi and polymoog!)