Yup, good posts here... The 4 strokes ARE addictive but I still prefer 2 strokes in most of my stuff- The Saito-72/82 and the YS-63 are incredible engines, but pricey-

The TT Pro-46 is IMHO the best value for 2 strokes under $100- and performs at least as good as the OS-46FX, but use the Tower Hobbies muffler for $14 and get 500-1,000 rpms over the stock muffler

The next step up would be the Irvine-53 which has a NOTICEABLE increase in power over the FX,TT Pro-46 etc... A couple other perfect matches for your SE would be the MVVS-49, K&B-48, and the Webra-50GT - The Webra has instant throttle response and is lighter than all others listed, except maybe the Leo... The MVVS is rumored to have awesome throttle response also--(I don't have the MVVS) and the Screamin-48 (K&B) is one of the best kept secrets in this range!

Also, the Tower-75 is an impressive engine if you are going bigger but none of the 60+ size engines would be a good fit in the SE- stay with the 46-52 2 cycle, or 52-82 4 cycle engines for the SE-

My favorite part of the hobby is deciding what engine to get for what plane [X(]

Keep us posted!
james
P.S. I have flown Somethin' Extras with everything from a Magnum-40XL, to the K&B-48, and finally the Irvine-53 (Tower Muffler again) The Magnum flew it fine but no 3D and limited vertical, the K&B seemed close to the Irvine-53 in power and performance, and both had unlimited vertical--- Stay with 12.25x3.75, 12x4 or 11x5 to keep the speed down or the plane could explode!