You can get GT35R clones on ebay for around $460 shipped if you really wanna go super crappy cheap.

 

Key word here.... "crappy".

 

bw s300 series hands down.
if you're disappointed with it, then clearly your expectations are bigger than your budget.
bw has some damn good turbos though, they spool really fast for a journal bearing turbo, because of the extended tip technology.