Welcome from a fellow new memeber mecury! From what bill has told me and from my own research, the sc250 and the soarer tt are one and the same beast, although I have never heard of one stateside. I'm working on being one of the few, if not the first sc250 to be in the states :arrrggg-matey:
The 3.0 engine is supposed to be the same as the supra non turbo, and the one I drove was fast indeed. Not as fast as my TT, but fast enough.
The only problems I have had as yet is the fuel pump ecu and the stock brakes going all wonky. Both of which are easy to fix, just got to find a good source for calipers, rotors, and pads.
I just wanted to add for all you soarer owners, if bill or your local parts sources can't find ya something, drop me an e-mail and I'll see what I can find here on okinawa.
Good luck mate!