I want to be a cool kid, too. Thanks to JayG for helping me spend my morning thinking about this stuff.
Handgun: I would say a nice .45 of some sort, but I started thinking about CCW. I'd go with a Sig Sauer 228. Its just a 9mm, but it'll conceal well , but be rugged enough for any conditions. Plenty of ammo too.
Shotgun: NIB Classic Ithaca m37 12 gauge riot. The one with the full out 8rd tube. Nothing recently manufactured.
Rifle: Yugoslavian m70 series AK. If no physical mods, I'll take an underfolder like my m70ab2. AKs. They kill shit out to 200yards just fine.