since you have all the parts plus an aftermarket manifold for a single turbo it would make sense to go that route, however, i didn't see a gearbox in your list of goodies...
if u can afford jun engine accessories, even if it was a special deal, u can afford to spend the money on an HKS turbo(s).
also assuming this car will be taken to the track; professional drivers run out of balls whilst driving the mines r34 (2530's) before the car runs out of power and although your not building a race car, anything that revs out to 10,000 rpm could hardly be called a street car.
best of luck with the build whatever route you take.