WT said:SpecOps - I'd stay away from the Glock. The NYPD has had extensive problems with them. Their NYPD Firearms and Tactics Section has a writeup of the problem on the NYPD website.
NYPD also carries Sigs and S&W's in 9mm.
That and the fact that 400,000 Glocks were recalled in 1992.
This from the guy who never heard of James Yeager and who evaluates trainers based on the number of gunfights they have participated in.
SpecOps:
The Glock is an outstanding weapon. ALL weapons, including Glocks, require training and practice on the part of the operator. Glocks, Sigs and Berettas are among the most reliable "out of the box" handguns made. You just need to decide whether or not you want an external safety and if you want a consistent trigger pull (as opposed to a DA/SA trigger).
Re 9mm power:
As Doc Gunn says, in .40 or .45ACP, practically any good JHP round will perform well. In 9mm, one has to be more selective. A GOOD 9mm round will perform as well as most any .40, but a "fair" 9mm round will be FAR inferior to a "fair" .40 round.
The best 9mm rounds with which I am familiar are the Winchester Ranger 127 +P+ (RA9TA) and the Cor Bon "DPX" round. The Remington Golden Sabre is well regarded in the lighter grain bullets (although the 147 gr. bullet is reported to do very well in longer barrels) as is the Speer Gold Dot.
YMMV