When I was getting my CA from the devil, he sold me a GT2540, of course I never ACTUALLY got it but I did do some research on it. While it's a little mismatched between the turbine and the compressor, it seems like a decent turbo that should be capable of about 350rwhp, give or take a bit for tuning and other modifications. You might want to check around
http://www.sxoc.com I think several people over there are, or have run them.