If all you are after is 400-450 all you need are a set of our 160/30% or 175/80% injectors and a 66mm hybrid OBS turbo. We have both on the shelf ready to go.
I'm kinda in same boat. But mine I will be towing with often just not street. Want be able pull but yet little fun on street. want same HP but real reliable..kinda looking around and see what the best would be and getting a ideal of $$$