SR22 and troy are both great options, but both are also significantly more expensive than an Axiom or a Tapco. Base 10/22 at about $225, axiom or tapco at around $80 versus $275+ for a Troy Chassis or $475+ for an SR22R.
Don't get me wrong I love the Troy, and I think the SR22R is pretty cool too, but much like the Red jacket ZK-22; I can't yet bring myself to pay that much for a plinker.
Yeah they are pricey options, my logic on plinking is a little different though, in that it is what I do the most of so why not put my money there where I can enjoy it more often.
I have a buddy who preordered one of those red jacket bull pups last June, last he has heard from them was them charging his card way back then. In the mean time he bought one of the archangel sets to soothe his need to be tacticool... I tease him daily about that red jacket stock though...