The Glock 19 is one of the best 9mm handguns on the market, and a great choice. But, as already stated, go try several weapons out before making a final decision.
I tried out upwards of 50 handguns before I decided on a Kimber 1911 .45 as my carry, it was what felt best in my hand, and what I felt best shooting with. You need to find the same thing out, what "feels" best to you, the most natural in other words. The last thing you want is to buy a weapon you don't feel entirely comfortable with, then make a mistake when it matters most.