doing a TT into an NA will only hook you up 280bhp without modifications. NA-T a GE and get yourself 350+. Over 400 gearbox might go pop.
If you go NA-T, build your own kit, get good parts and get cheap where it doesn't matter, intercooler piping etc. Don't cheap out on turbo or ECU.
I'm ordering a BW 362 for my NA-T. Anything much bigger will be too laggy.
You need to do a plan of your power goals and amount you have to spend, and build it around that. Choosing a turbo is a choice made by the power gains you want. High figures, time to spool etc.
Best thing is to look at peoples builds, see what power they get and check dyno curves for response and decide against other peoples results. Search!