Check out the Super tigre prices on the tower site. The G90 is a .60 size case and would give you much more power.
For speed on a .40 size platform try a K&B .40 model 4050 (ABC-Tuned pipe), or a rossi .40, or if you have the funds a Jett .40
If you are looking in the .46-.50 size try the K&B .48, Webra 50GT, or at the same weight a K&B .61 twist which is less expensive than either but will out run both if given enough pitch.

My addiction started later...over 140 planes and over 140 engines to date.