with sizing like 10/10.5 it can honestly make a BIG difference, those are often the borderline sizes for M or L bindings for most companies... get one that's snug*TRY IT ON AND WALK AROUND* you dont want your foot sliding forward, and you definitely want to minimize heel lift in that area of the boot.
In addition to that, be sure to take care when sizing bindings with boots as well... like i said. Make sure you KNOW your boot size before choosing a binding, and if at all possible, hit up a shop and strap one on to see the fit.
EDIT: A favorite for during the 2011 season has been a NS Evo for MANY riders freeriding... can take it anywhere on the hill and play. May like that? I'd offer more suggestions but im pressed for time... heading to the hill!