If you pair a turbo to be in boost at the low end, be aware, that thing is gonna be spinning ALL the time. Turbo whistle and DV is cool and all, but gets annoying after awhile. Just something to think about.
Since you're building the engine yourself, do it right from the beginning if you're planning on putting a turbo on it. Do your research and don't cheap out. Otherwise you'll be tearing the engine down again or selling it.