1911s excellent choices, just make sure if you get one, it feeds the ammo you will be carrying. Modern 1911s are built to feed pretty much anything, but magazine followers will have a slight effect. With a 1911 you will be limited on your shots but 8 or 9 .45 hollow points is a whole lot of nasty in one or two hands. Plus you can always carry spares. You can get an alloy or aluminum framed 1911 and that will really save you some weight, and you can go for a 4.25 or 4" barrel and that will also cut some weight. I would go with springfield, Colt, sig, or Dan Wesson. Kimbers have been iffy. But if you take care of your gun it should take care of you.
Glocks, if you like em, try one out. I personally don't like them, but do trust and respect them. You have to really like the grip and trigger to run one. I like nothing about them, but they are good guns.
S&W M&Ps are good trust worthy guns and have one of the best feeling grips out there, but their triggers can be crappy, but there are aftermarket trigger options as well.
Cz75s or P07/P09s are excellent guns and highly recommended, the cz75 has one of the best feeling grips out there as well, but is heavier than polymer. These are known to be very accurate and fairly reliable
Sig 226 are good high quality guns, grips are too fat and guns are too bulky in general for me though, bug highly respected, highly accurate, very reliable guns
Walther P99/PPQ, excellent German made and designed pistols. I have a PPQ .40 and love it. Extremely ergonomic grip, super super nice trigger, reliable, very accurate. Excellent pistol. Mine is my ccw.
H&Ks are great tough accurate guns but expensive and alot of people will say not worth the extra money. Their newer VP9 and VP40s are nice but new and not proven yet.
Berettas are great too. Although I have heard the locking blocks like to crack under about 25K rounds. I don't know much about Berettas, just was never really interested in them.
Springfield xds are excellent poly striker guns. Accurate, reliable, tough, some people just don't like the ergonomics or looks. They have been around awhile
If possible try to test fire the guns you are interested in. Go with what feels best in your hand, and dry fire everything several times and see which triggers (and trigger resets) you like best. The 1911 trigger is best, I would say Walther PPQ being second. Don't dismiss .40 caliber, it is a tad more expensive to shoot, and the guns will hold slightly less rounds, and its harder to shoot accurately, and your time between shots may be a little slower,but that's what spare mags are for, and the power increase is awesome. You get the speed of a 9mm with similar weight of a .45. There are 200gr bullets available at 850-1050fps, which about equals how fast a .45 pushes a 200gr bullet.