Put an Irvine .53, with a 12.25x3.75 prop, with 1 inch added to the rudder. It will absoutly scream! It will hover/trq at half to 5/8 and pull out good! If you want an all out 3d monster get an Extremeflight edge 540t profile plane. It will do anything, its absoutly amazing, so is the sig, but it can't do extreme aerobatics like the edge can...

Matt