My $0.02
First, I have to agree with RodneyKSig when talking about the price of CCWs. I recently received a NIB Hi-Point C9 as a gift. Expecting the worst from a $150 9mm I headed to the range. After several weeks and 850 rounds (cleaned after each) it's now sitting at the manufacturer's plant waiting for repairs. I'd say it's broke-in alright!
Anyway, I've found that if you have $400-500 you can get a quality firearm from any number of manufacturers. The best thing to do is fire as many weapons you can and let your experience with the weapon be your guide. What works fine for the next person may not be the best thing for you.
I myself bought a used Glock 19 with trijicon night sights, hogue grips, an extended mag release, and 2 15-round magazines for $450!! This gun is in perfect working order and I fire it weekly. For that reason alone I can highly recommend purchasing a used Glock. Have someone check it out for you if you're unsure (with any gun really).