RE: Which prop for IMAC?
Go with the 28X10. Your DA with cans will have more than enough umph to swing it but have enough load to keep you from ripping the hell out of it. It works well on the downlines. Put in a throttle curve that will soften the resoponse between 1/2 and 3/4 throttle as you will be spending most of your time at that throttle position.
Shawn