I would say do your FMIC & Exhaust First, with a close second to the fuel pump. Then save up for the turbo, injectors and all that, have it all put in the same time to save on labor and tuning charges. Well that's what I'm doing, and my turbo choice would be a GT3076R, my aim is to get a reliable 250rwkw in my series 2 r33. Also maybe do a search, there are plenty of posts on here and other websites about turbos...just depends to how much you want to spend and what power figures you want.