Rob, If you don't get any traders in here, you might get better results at KVR (providing you can "trust" the trader). I've bought quite a few synths from there and had very good experiences, but I've also checked their selling history before buying.
I've been interested in getting Synthmaster (FM8 & Dune as well) for awhile, but never had that "extra bit of cash" just to treat myself for the greed......I really just don't have a need (yet).........

(If there's any others that you're interested in, let me know.....)
Good luck with the trade!