<< Guns on my purchase list: AK-47, SKS, 12 gauge pump shotgun, FAL, Winchester or Marlin .30-30, M1 Garand and AR-15/M-16 (if I hit the lottery on those last two). >>
If you get the AK, I'd avoid the SKS. You only really need one or the other, and the SKS is an older design. They're super cheap to shoot, but that's about it.
I bought a bushmaster ar15 a few years back. Nice rifle, I've been impressed with it. I think I paid just a shade under $850 for the gun, two 30rd clips, a few boxes of ammo and tax.
Next purchase for me is an m1 garand through the CMP. Around here, that will cost me $350 ish, but it'll definatly be worth it.