A lot of good advice above. The best size bino for you would depend a lot on the terrain where you hunt. With shorter distances or a lot of brush, I tend to use an old pair of 7x30 Swarovskis. They're small, light weight, really good low light performance and seem to work very well for hunting in lots of brush areas. When the distance gets out past 300 yards or so, I find myself wanting a little more power.

What do your buddies use in the same kind of terrain? Maybe use a few of theirs on a scouting trip and see what power/size/objective you think works best for you in the terrain you hunt. Like Kiddogy pointed out, we don't know what kind of terrain you hunt in so it's kind of hard to give you a more specific answer tailored to your hunting terrain.