Easiest thread to answer, ever.
1. Ruger MkII in stainless with a bull barrel (own it)
2. Glock 19 (don't own it)
3. Ruger P90 (own it)
I have owned my P90 for 15 years now, have many tens of thousands of rounds down the barrel, and I can tell you sincerely that I would choose that gun over literally any other .45 there is. I know there are prettier guns, I know there are more expensive guns and I know there are people that will think I am off my rocker. With all that, I still choose it because I trust it.
Plus, I shoot pretty good with it.
Frankly, these three would be my choices regardless of budget. I should also point out that this is a personal choice as opposed to some sort of snobbery. I have owned a Buckmark and enjoyed it, I have owned a couple of different 9mm pistols (and currently have an SR9 and a Glock 26) and enjoy them, and have owned and liked shooting 1911's just fine. Chances are better than average that I will own a 1911 again, as a matter of fact. I also very much enjoy shooting revolvers.