Was using a GT25/74 on my gte project before I sold up, same as the red top sr20 turbo, seemed like it was fitting for what I wanted.
Lately I have been looking at using the T22 from the z32 300zx, I think it will fair alright being that it is used on 1.5L.
Also, don't get confused with GT turbos being ball bearing, they use GT on any of their series so even bush turbos (like the GT25/74 above) are called a gt turbo.