well, this is not in the spirit of your question, so take it with a grain of salt, but if I had 2500 to spend on one .45, I'd buy a couple of old army guns, or maybe 50's commercial guns.
seriously though, i've seen some of those era guns run like the enigizer bunny, dad has a remington rand that must be closing in on the six digit mark for rounds through it.
but, to asnwer yor question, I might do a custom build from one of the premier gun smiths like Yost or somebody. If its you're only gun it'd be nice to have a personal touch rather than a stock package.