The FXII 4x33 or 6x36 would be about ideal for you, size-wise, if you wanted to stick with Leupold. I can't recall anyone ever knocking the zero-holding bona fides of those 2 scopes.
I have an FX II 4x33 that's been acting a little weird on three different rifles lately. It's headed back to Leupold for a checkup. Not ready to slam it entirely, but there is a problem. That said, I've had nothing but perfect performance from another FX II 4x33.
Okie John