If what you're looking for in a build is somewhat typical ie. beavertail, skeletonized hammer and trigger, different grips and sights, take your time in selecting your starter. It would help if we knew what your cost expectations are, both beginning and final.
For a great out of the box shooter that eats varied ammo and spits it out positively I would recommend this:
http://www.budsgunshop.com/catalog/product_info.php/manufacturers_id/31/products_id/26335.
For a no frills, built as it ought to be, starter pistol to change things around on (preferrably by a gun smith), this is your pistol:
http://www.budsgunshop.com/catalog/product_info.php/manufacturers_id/197/products_id/32590.
For a classic original that you won't want to change parts on:
http://www.budsgunshop.com/catalog/product_info.php/manufacturers_id/1/products_id/55899.
Again, it is my feeling that a 1911 should be left stock (with the possible exception of grips and sights) unless you are doing a custom build. I would not recommend the following makes if that is your intent:
Para GI Expert, non-standard parts won't allow for many upgrades, though seems to have quite a few favorable reviews save the finish which often fails.
RIA/Citadel/Charles Daley/Phillipine anything, you'll want to start with a forged frame and these ain't it, nothing wrong with them as shooters, especially the RIA but again, you'll eventually scrap everything if you start here.
Sig/Kimber/S&W, these all have external extractors (with a few model exceptions)- a big no-no to some purists but all designed to be bought as ready to shoot sans modification.