Baer, Brown, and Wilson all have excellent reputations that they earned over years of building 1911s. They all use good parts (the foundation of any good gun), and their workmanship is second to none, so you can't go wrong whichever you choose.
You should try out guns from the different makers before you decide. Although all build 1911s, they each put different finishing touches on their pistols resulting in a slightly different feel to each maker's product. I have the most experience with LB as I own a Concept II. Baer makes his pistols tight, and they lock up like a bank vault. I like the tank-like feel of Baers, and now my preference is for 1911s with a similar build quality.
A couple of buddies at the range have Browns and they've both let me shoot their pistols on numerous occassions. Browns feel a bit sleeker in handling than Baer's do. I don't like the feel of a Brown gun any more than I do my Baer, but it is different. All three Brown's I've shot were just as accurate as my Concept II, and to be honest they all had better triggers. The Brown triggers weren't significantly better, but the difference was noticeable.
I've shot one Wilson, a CQB. It shot as well and as easily as my Concept II, my Springfield Custom Carry, and the Browns I mentioned above. Its quality was immediately evident when I picked it up and shot it. That said, it wasn't for me. The CQB and most of Wilson's offerings look a bit too tacticool for me, I prefer blued steel and wood.
Here's a pic of my Baer -
Les Baer Concept II