you turbo size will determine what kind of power output you are looking for.

but running 5-7 psi, IMO, i would go with a t3/t4 .50 trim and piece together the kit for the car. just get the manifold and whatnot and then get what else you are needing.

also, when looking for a turbo, make a decision of either water, or oil cooled, cause cause you might need some different hardware depending on whichever you choose.

if you go oil cooled, i would suggest in getting another oil pan to tap, and probably use the adapter for the oil filter to run one of the lines.