Assuming I wouldn't have to bother with licensing and such nonsense, and that I could have them for the prices they fetch here on auctions/in the shops...
Swedish K SMG. Would cost me probably...$300-500 perhaps, in good condition.
FN FAL: $7-800?~
FN FNC: $600~
Supressed and scoped AR-15, although with one of those upper receivers that allow for a folding stock: $1500~
Browning Hi-Power
Nice bolt action, scoped and threaded for supressor.
Glock 17, 18, 20.
Couple of Ruger 10/22's
AK-47
H&K G36
H&K UMP45, one in each caliber.
Snubnosed .357
Snubnosed .44
S&W 500, 4 inch barrel.
If there's any money left, I'll spend it on ammo!