Oasys has never interested me. For some reason I have an artificial barrier on the amount I am willing to spend on a single synth - thats basically the cost of a TI keyboard - any higher than that and I *very* reluctant. The pretty much counts out the Oasys
Part of it is I just cant live with having too much done through a single sound engine, so prefer the variety of many engines.
On the v-synth - thats a really quirky machine - most people are initially completely blown away by it - but I know more people who have bought one and sold it after 6 months or so than those who still have it after a year. Many people just cant get on with it - or find they end up not using it that much because they dont start to really exploit its sample abuse capabiliies, and stick to trying to use it as a VA. Thats seems to apply to both the V-Synth and the V-Synth XT.
Ive gone through a long period of not really using its capabilities that much (actually I was using it as a D50 instead) Its still my main controller keyboard (as the TI's midi ports get shut off as soon as VC starts and it was *supposed* to have ended up as my main controller keyboard - Grrrrrrrr).
Now Im statring to use it again for sample processing - mainly as a board for working with a sample from combersome fx chains; for eg motif ES paino -> V-synth -> Virus TI -> outboard compressor, EQ, etc when I want overdriven accoustic piano sounds, heaped with reverb and squahsed to hell - now I tend to capure the sample and stick in the v-synth instead.