I have a buddy that has a Tower .46 on his and it moves along pretty good. It was clocked at 97 MPH. Not bad for a Tower .46. If it were mine, I'd put a Rossi .40 or a YS .46 on it. You talk about move on! It would difinately go places! You'd probably get close to 115-120 out of it if you were to prop it right. Just my 2 cents.
Sorta on the same subject, but different plane. I have a Sig Cougar with a Picco .40 on it. I clocked it this week at 122 MPH. You may want to try a Picco. I love mine.

Good Luck,

John