I would recommend the 10x7 if you are interested in going faster...

The APC 11x5 would be a better choice if you want quicker accelleration, shorter T.O. roll and stronger vertical perf.

The APC 11x6 is just a wee bit much for a stock Evo Alpha .455/.46 (w/ stock muffler )

If you really want that Evo to run great, put a Tower .46 (Aquacraft .46 / GMS ) muffler on it (15 bucks ) with either the APC 10x7 or 11x5 and use 15% nitro...don't worry about letting it rev up a bit. Mine spins over 14K with the afore mentioned combination, which is well within specs.

Just make sure your prop and spinner is balanced...an un-balanced prop and/or spinner will wear out bearings faster than a few "extra" revs.

FWIW 14K is not really "high" r.p.m.
If you were going much over that though, I'd say to consider the bearings...but the rest of the engine isn't going to know the difference.