Im a Gun guy. I'm into Glocks and recommend the 9mm versions to all new shooters. Start with a Glock 19, buy 1000 rounds and take a training course. Then you can gradually move into the more powerful calibers. I personally carry a .40, Glock 23. Best weapon I've ever owned.
The AR is my choice of carbine as well. Big discrepancy on brands, some are real junk. I'd stick with Bravo Company(my personal brand), Daniel Defense, or Colt. I would recommend another forum for this. Go there an READ, read, read.
M4Carbine.net If you need a referral, let me know, it can speed up the approval process for getting in there.
PM me if you have any other questions, or we could get a thread going in the lounge. let me know!