It depends on what you want the car to drive like? My turbo is the same as the one you've shown, it doesn't really hit full boost til 4000rpm, but will hold boost quite high up the revs. They are good for a reliable 380bhp.

If you car is pretty standard, I'd personally get your standard t3 rebuilt and a 360 degree bearing fitted and aim for 320ish bhp. You'll have little lag and the car will be nice to drive.