The best and the most affordable are two very different things.
The Sistema isn't really a clone--might not be a Colt but that's a mil-spec real pistol. The Baby Eagle and Witness aren't 1911s.
The Sistema is a great deal and you don't hear anyone complain about them. Customize as you wish.
If you want a reasonable 1911 made in the second half of the last century, and you want to spend less than $500, that's where it gets very, very hard. The Springfield Mil-Spec is one of the few worth discussing. I would far sooner get one of those than drop an equal amount on a Daly, Wesson Pointman Minor, or worse.