1 -Colt SAA 1873 Peacemaker - I know people who still carry these, hunt, shoot, collect. An archetypal firearm if there is one.
2 - Colt M1911A1 - over 100 years, dozens of copycats, not going anywhere soon.
3 - S&W Model 10, 19, 36 (nearly equal). From ankle, to pocket, to hip.
4 - S&W Model 29 - Was that 5 shots or 6? Do you feel lucky? A serious game-changer.
5 - Luger P08 - but no one carries these anymore do they.
6 - HK P7M8 (thumb, not bottom, mag release), flat, compact, accurate.
7 - Glock 17 (with light trigger mod) Classic.
8 - SIG - several come to mind, but I'll pick 226 in 9mm for CQB Alex for $500
9 - Makarov 9x18 - various styles. Cold war symbol of state power now $250 for C&R holders... ammo purchased separately.
10 - Well, that's 11, but what the heck.
Chosen for utility, world-wide distribution and market penetration, reliability, longevity.
I still shoot my grandfather's 1911 from WW1. Mfd in 1913 it's still pristine, blue, reliable as anything else in my collection. When I carry, it's usually a 1911 variant, but I'm also fond of the HK P7M8 since I first learned about it while learning to shoot from a CIA spook some years back. I have a couple of first gen. Colt SAAs that will be working long after I'm no longer able to. Walther PP came to mind, but it's really more of a niche market. Very nicely tooled, finished, I've owned a half dozen of them, never got close to any of them.
YMMV.