I'd go for the combat or assault rifle, not entirely sure which is which. I'm guessing the combat is the SCAR and the assault is the M16 but I'd pick up either of them though I'd probably go for the M16 over the SCAR if I had the choice. Then I'd grab a melee weapon, either a machete or an axe as I like the crowbar but I can't imagine it being that convient fighting zombies no matter how badass Gordon Freeman looks using it, and away I'd go a zombie hunting.