If you're looking for something to boost at around 6-8psi, don't go with a t3/t4 garret, they're too large, they will have too much lag, and produce big numbers after 4-5k rpm's. I'd go with a .42 or .48, looks around for some junkyard turbos with low miles and no wear. A 14b might be a good choice too. I'd just stay away from larger turbo's since you only want small boost.