troy from experience with my car atm, 250rwkws is a nice figure for everyday driving
uve still got enough power to boot without worrying too much about traction problems (well i dont seem to with 18's)
and ive got a nice bigish turbo running pissant boost (10psi)
so a smaller turbo with better spool and response would suit better if u were just aiming for this figure
my 2c