I don't know much about handgun manufacturers or models. I'm looking to get my first handgun and I managed to narrow it down to 3 possible choices: -Sig P250 (compact, .45 ACP) -Glock 21 -Glock 30 I practiced a little with a .45 ACP handgun and I thought the caliber would be fine. I haven't fired the ones above, but I did handle them for a minute, and they feel pretty good in my hand. I'm planning to use it for concealed carry. Can anyone give me some feedback on their experiences with these? Are there any others I should be looking at instead? Also, I don't know anything about holsters or positioning. Does anyone have a suggestion about that? I know it will depend on my personal comfort a lot, but maybe someone can suggest a brand of holster or possible positions. Thanks.