While I can't claim be an expert to know what turbo will be best for you ;), there is one thing that comes to mind when trying to pick the right one:
How far will your project go?
If you plan on "going all the way" a larger turbo has the most upgradibility, so that you do not need to replace it later as you continue to build the engine.
If you want to go full out stage I- and that's it- a smaller ball bearing turbo can provide MUCH quicker spooling (less turbo LAAAAAG) and a broader, more consistent power ban. I have read about the Garrett "Disco Potato" turbo, which is compared to a S/C as quickly as it spools.
Here's a site I found about this one. Hope it helps.:D
Click this for info on the T3/T4 "drop in kit". Dyno's
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