I would suggest starting with a nice base 1911 and go from there. It's hard to know what you really want until you see and experience all of the options. For instance, do you want Heinie Sights, Novak Sights or Bo-Mar Sights? Government or Commander? Blued, Stainless or Hardchrome? Standard grip safety or beavertail grip safety? If a beavertail, Ed Brown w/ or w/o memory groove, Smith & Alexander, Wilson, etc?
I'm not trying to confuse you, but these are just some of the many options on a nice custom 1911. If you don't know them or and have experienced none of them, it would be hard to gauge what you want. Laying out several thousand dollars for a custom one could be a mistake. Is the 1911 really for you? (Some don't like it). It would be a lot easier to sell a Colt for $500 than a custom gun for $2500.
My suggestion, buy a NRM (New Rollmark) 1991 Government or Commanderfrom Colt, depending on your area, $500-$600. Shoot it and see how you like it. Does the hammer bite you? Are the sights too small? Find out if you like it or not. Experience some sight options on other 1911s to see what you prefer.
After you have some more experience you will have a very nice base gun to have fully customized or slightly tweaked, it's up to you.
There are more options than Colt too. A lot of shooters are fans of the Springfiled Mil Spec models for a good base gun, or a Springfield Loaded model for a gun that comes with some typical upgrades, Novak sights, beavertail, etc.
I think Colt and Springfield are going to be the two best guns for a base gun. Kimbers are nice too, but I have heard (albeit unconfirmed) issues with the Schwartz safety system and the fact that Kimbers start at a higher price from what I have seen.
Good luck