If you are looking for a GREAT first pistol that you plan to carry around, hands down the Glock 19. Seriously.
Glocks can be disassembled with your eyes closed. Parts are cheap, and they are far more comfortable to carry around than a Sig, Kimber, or any other full steel pistol.
A second choice..which happens to be my favorite Pistol manufacturer is HK.
Regarding Sigs...I own a P226, 228, 229, 220, 239, and my beloved German police trade in P225.
Pistols and AR15's used to be my main hobby before I got into large scale RC planes.
I have carried them all concealed...I always go back to the G19, Sig P225 or my HK P2000
Slim, lightweight, and comfortable to wear in a Galco pancake holster.
The P228 should still be around new, but you can always get a very nice used one.
The P229 in 9 and 40 are great, but end up, for me, to be a pain in the arse to wear for extended periods of time.