Glocks are great polymer pistols. They are simple and reliable, and easy to operate, clean and maintain. And at $700 bucks, you'll have a pistol that will last you a lifetime.
That being said, they haven't been improved on since thier introduction in the '80's.
Easiest way to talk you out of a Glock...S&W M&P. They are the same price, and have much better ergonomics. Most of my pistol shooting has been done with a Glock, but firing off one 10 round mag at the range, and I was an M&P convert. It felt better in the hand, and felt better when firing.
Another polymer gun to look at is the Steyr M9. Not much to look at, but its cheap, fits the hand well, and is well-made.
And then if you feel like blowing that $700 budget, and want polymer. You can never go wrong with the H&K USP. Plastic Fantastic! That is one gun I'll never part with!
...or you can go back to the heavy metal crowd and buy Beretta. You can never go wrong with an M9!!