the 'T' size is largely irrelevant and simply applies to the flange size where the turbo joins the manifold. You cant make any informed decisions based on this alone. You need to know the a/r's of the turbine and compressor housings.
Saying T3 at least is meaningless - you can get a T28 that will be way too big for a stock b16b likewise you can get a T3 which is tiny.
I run a large T28 on a b18 and can produce upwards of 300bhp. The size of turbo will determine how quickly it spools up, the kind of heat it generates, the point it which it chokes etc. There is alot of research needed in order to choose the perfect turbo for a specific application.