If you want to constantly rock 60k, you'll need a stash of gold, most likely from selling a loompoint.
A better strategy, that Diggles suggested, is to have two different sets of equipment, one for low multipliers like x1 and x2, and then your good stuff for x3, x4, and x5.
Why can't you go under 60k? Are you heavy cav or something? If you're a melee, then you can often take a cheaper version of the weapon without sacrificing too much.