A few questions for you:
1. Are you going to run a built engine? (Forged internals)
2. Will you run a 4G64, 64/63 hybrid or a 4G63?
3. How much power do you (realistically) plan to make?
4. How much do you want to spend?
A quick answer is go dig around on DSM Tuners or DSM Talk. You'll find a wealth of information on general turbo stuff. Lots of info on Holset turbos over on Tuners right now.
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