Where to go shopping for a new turbo?
 

I'm in need of a new turbo. My car is currently at a reputable specialist having a rebuild and its likely that I'm going to be fitting a new turbo. I'm gonna have a little look around elsewhere before just buying one that said specialist has to offer. But where to look?? I'm after something capable of 400+, something like an MD321 or a TD05 20g.

Funds are tight, hence the need to shop around. :)