Hi Debounce. No offense meant but you need to take a bit more than a week to learn what's the right piece for you. As the last few responses suggested, take the time to learn about the calibers, modes of carry, & ergonomics of different guns. Hey, a year from now you want to look back & smile that you bought the perfect gun! A lot of guys that jump in too quick look back in 2 months and own a gun they don't like, can't shoot, etc. Do it right the first time eh?
Start by shooting as many guns/calibers you can. Ideally, try to shoot a .38, .357, 9mm, .40 S&W, & .45acp. If you have friends that shoot ask 'em to take you along. Otherwise get the phone book out, call every range/gun shop & ask if they have a familiarization class that lets you shoot different guns. That kind of class can be cheaper than renting each of those guns. If nothing else, go to the range and start renting handguns. Talk to the range guys, they'll help you out. As you shoot those guns, do some searches here & on other boards to learn about the relative merits of different calibers.
Secondly, devote Saturdays to visiting gun shops. Go to every one in your area. Look at every brand they carry. Ask about the merits of each (but don't take anyone's advice as "gospel" . . .including mine!) And keep asking questions here along the way. The point is, you gotta learn for yourself. Look at it this way - It's hard to wait but take your time and you'll be glad you spent your $350 where you did. Jump too quick & it will cost you more $$ & time in the long run after you sell the first gun (maybe at a loss,) save more $$, and eventually buy the right piece later.
Finally, if you just can't wait. Buy a used .22 pistol so you'll have something to go plinking at the range while you learn what you ultimately want. Hey, a .22 is great practice to learn proper grip, sight picture, trigger control. It's not a bad way to start. sorry for the long post, hope there's something in it for you.
Hiker