If I got replacement value for the guns, ammo, and accesories, then I would buy an M-16, M-60, couple of Mac-10s, and maybe a Browning 1919 and enough ammo to feed them for awhile.
After that I would replace about half of the guns I now own, but even that would take me awhile. If I only got what I paid for them, then I'm way behind the power curve as I usually only buy when I find a great deal and couldn't possibly be able to replace them today for what I bought them for.