ORIGINAL: freakingfast

The most limiting factor you mention, is your desire to use the OS 91 FX because of size and weight. Id have to agree with MJD with his suggestion of a .60 pattern plane.
If you are willing to go a smaller plane and engine and you insist on an ARF, that leaves one plane that can do all the maneuvers you want and than some. That plane is the Outlaw http://www.extremeflightrc.com/html/outlaw.html
To get the most of this plane use no larger than a .30 size block, like an OS 32 or a Webra 36 (preferred) http://www.swanyshouse.com/engines/engines.aspx on Macs tuned pipes.
IMHO the Orange one is the best color, the red white & blue or blue & yellow are harder to differentiate top from bottom. It looks like the only have blue & yellow in stock..call.