small and fast (not the fastest... but its QUICK!) try a Sig Kobra. Its a fairly simple kit designed for the style Pattern flying done in the 1970's... quick flying actrross the field and doing one "show stopper" maneuver in the center, converting all the speed you had built up into the vertical performance needed.

Very fast with a light weight .40 (plenty fast with a strong .25 really.) and its a stable design. No bad characteristics to get you in over your head.

A little larger, same design really is the Sig Kougar. Meant to be flown with a .40.. the airframe canhandle a .60 for speed runs.

Remember... as you add power you normally add weight. There is a point where the added weight harms performance so much that the plane actually becomes slower.