Here's my thoughts, FWIW:
Sig - No personal experience. Owners seem to be happy with them. Don't know how well standard after market 1911 parts fit them.
Kimber - They get bashed a lot in various forums. I have had four (still have two) and have had no operational issues with them. I don't like the fact that their 4" Pro versions require a special take down tool (a paper clip works as well) to field strip. Some complain about the amount of MIM used but I've not had a problem.
Para - Mixed feeling here. I had one (a double stack) that was very ammo sensitive. Had an LTC that I really liked - accurate, fun to shoot, and felt like it was part of my hand. Too bad it went back to the shop twice (replaced the hammer, sear, and disconnector) and then the Regal finish started coming off in sheets. It took 16 weeks to get them to refinish it. For some strange reason I didn't like it as much after all of that and got rid of it.
For carry I definitely recommend a commander size 1911, preferably with a bobtail. I carry IWB and find that a 5" gun hits the seat before I do when sitting and drives the grip into my ribs. A bobtail makes it more comfortable to carry and easier to conceal. I also think the commander has a better balance. YMMV.
Now for the unsolicited advice:
If you want to stay in this price range, I'd recommend looking at Springfield or S&W. Great guns with good warranties. I'm really liking the the new S&W "E" series. If I were in the market for a new carry gun I'd be looking at the S&W 1911SC "E" series really hard. It has a "bobtail" and a scandium frame that make it great for carrying. I'd avoid the scandium frame for competitive shooting or putting tens of thousands of rounds through it although they are supposed to handle it okay.
For a little more money, Dan Wesson is hard to beat. After that you start getting into the higher end Wilson, Ed Brown, Les Baer, and others.
Sigh, so many 1911s and so little money.
