Haha....this thread has gone way off topic. Back on course after this....all I am trying to say is your remark of....

"Finally, I wouldnt want more than 350whp in an RSX, its just not that practical, unless you like racing from 60mph rolls"

...was dumb and misinformative. Yes fwd cars are hindered by the loss of traction, but there are many different things you can do to help decrease this and one of them should not be make less power.

Back on topic, if you have the time and resource, piece your own kit together. I think a GT30R or a GT35R would be nice on a RSX. If you do not and you want someone else to do it for you, you should probably go with a prefabbed kit.