Your main weapon of choice? Hardcore. It's much harder to kill with than on the old game, I don't bother with it... although I saw you could get a thermal scope for it, which does look interesting.
Why not just permanently unlock it with your prestige token anyway?
what what what!!! Permanent unlock?! I love you duncs... There, I said it!
I love the crossbow, with no scope - you have to get a bullseye to kill with it now, but it fires so quickly that so long as you have quick reactions you can win the "draw" even close up.
Edit - oh yeah, I score high, but I die a LOT!