Wow, coming up with 10 pistols is gonna be tough. I haven't even owned 10 pistols.
#1. Sig P6. Best, most comfortable pistol I've owned and shot. I hesitated buying one since I had never heard of them before I saw one at a gun show. I'm so glad I decided to buy one.
#2. Sig P226 Elite. Second Sig I bought, and I've been shooting IPSC with it. The trigger is just plain sweet, for a production gun. Great, and beautiful gun.
#3. CZ-75. Ran into a co-worker at the range one day and he let me shoot it. Almost as comfy as my P6, but I never saw the target, so I don't know how I shot it.
#4. Beretta 1934. It's not the greatest shooter, not the most ergonomic pistol, between the oddball safety/slide catch and the euro mag release, but I have one, it's a family heirloom, and nobody said this list had to be objective. The last pistol I'll ever even think about selling.
#5. Browning Hi-Power. My buddy has one and it's a pleasure to shoot. Full size 9mm is real easy on the recoil, 1911 style ergonomics and accurate enough.
#6. Walther P22. Just bought one and it's good cheap fun. It's also built to accept a can, which it will eventually get, so that earns it some points.
#7. Ruger Mark X. Meaning Mark I, II, or III. I don't know them well, but they are just fun and enjoyable. The only points they lose on the Walther P22 is that they don't look like real guns.
#8. Beretta 92. Say what you want, but it's what they give me and I'm not totally dissatisfied. With JHP (which aircrew gets to carry) it can actually do some damage. I've seen guys shoot very well with them (I'm not one of those guys, yet) and it's not bad looking.
#9. M1911. I've shot Kimber's, Springfields, Colts, etc, and while I don't know the difference, really, the single stack, single action .45 is probably the basis, or at least the inspiration for all the guns listed above. I'll get one eventually. It's on the list of required guns.
#10. Sig P220. I've shot them and they're just as good as my other two Sig's, but they're basically the same as a 1911 (capacity and caliber) but without the iconic image and history of the old GI gun. It's on my list (along with the rest of the Sig catalog) but not in the near future.