Kukri (phillipinese knife-sword)
Sabre (like the ones from Civil war)
Trench knife (knife+knuckledusters in one, could make you deliver alternating stabbing and punching damage, and can't be pulled out of hand, unless they break your fingers)
CZ line of pistols (love 'em)
Skorpion (small smg)
Panzerfaust and/or Bazooka along with really rare ammo for them (they should be collector stuff I guess)
FAMAS (bullpup french rifle)
Dragunov sniper rifle
Barrett cal. 50 (that's ought to put down anything)
Old time single action Wild west revolver.. Samuel Colt for the win!
We need more rifles.. I'm out of ideas.
High explosive grenade
White phosphor grenade
I guess I can't add good old german potato masher.. the charge would probably be useless if it's in future
Claymore mine - arm, plant front toward enemy :)
Nuclear bomb. I'm not kidding. I WANT TO MAKE MY OWN APOCALYPSE.
Thermite charge - very special sort, could be used to cut through something which can't be cut. Reminds me that jackhammer would destroy its tip while smashing metal doors, or your dude would bounce for an hour, that's sort of unrealistic. I love this stuff, really, it cuts everything. http://en.wikipedia.org/wiki/Thermite
Home made shrapnel grenade with really weak explosive power (like one tile) and produces a rain of shrapnel that showers and shreds anything standing near
Might come up with more stuff. I love things that maim, destroy and explode.
If I have some already proposed weapons, don't mind it, I didn't stole them, just shooting ideas out of my head.