Well, I HAD a Walther P99. Just didn't like it (personal taste). However, like others have said, go someplace where you can rent one and shoot it BEFORE you buy it. Once you buy it, shoot it, and don't like it, if you try to sell it back, you'll get considerably less $$ than what you paid.
Also, going with what others have said... don't let someone TELL you that you HAVE to stay away from a certain caliber.
I know a guy (former Marine) that gave a friend of ours sh*t for getting a Walther P22 as his first gun (he's an inexperienced shooter, and wants to practice on something he'll be able to control and afford). I gave the other guy sh*t, partly for being an idiot, and also for the fact that his ONLY firearms experience is with the M4 and various machine guns (no pistols) - just to prove a point (I know, I can be an a$$ sometimes, but they are my brothers, so..).
Insert witty comment here......
Vincit Omnia Veritas
Vincere est Vivere