I'm also in the market and have been doing my homewaork and now I think Im more confused than ever. I've narrowed it to the Glock 19, and a S&W .40 Sigma series. Any comments?
<S>majchaos
Go with the Glock. The Sigma has some rough triggers and is nothing more than a badly done clone of a Glock anyhow. I had each and I sold the Sigma. /snip
Maverick is spot on. The Sigma is nothing more than a GLOCK clone. Also there are far more accessories (lights, lasers, holsters, magazines, sights, etc) for the GLOCK than the Sigma, even though they are very similar. While many folks who have had Sigma's had no problems with reliability, they did have "issues" with gritty and/or heavy triggers. If you are set on .40, you might want to consider the GLOCK 23. Same size as the 19, but in .40.
When I was looking for my first carry pistol I also had it narrowed down to the GLOCK 19 and the Sigma. But when I held the GLOCK and Sigma I just didn't like the way they fit in my hand. Then I picked up Ruger's SR9 and it felt like Ruger had made the gun just for my hand. Needless to say the SR9 went home with me. I think it was the slimness that did it for me, the GLOCK and Sigma felt ... chunky.
However, hindsight being 20/20 I wish I had gone with something not quite so new. Holsters were difficult to come by for the first few months, and night sights are still lacking. I'm pleased with the performance, with the single exception of sight visibility. Over time (and a few 1000 rounds) the front sight has become "dirty" looking. No amount of Hoppe's #9 gets my white dot any less "dirty". I may have to resort to "repainting" it.
When you consider handgun choices, also remember you are going to want things like holsters, sights, magazines and magazine holsters. Maybe even lights and/or lasers. Oh, and invest in a QUALITY belt. It makes carrying and concealing so much easier.
Good luck with whatever you choose.