Three Ruger revolvers...
Single Six Hunter .22lr/.22 magnum convertible
4" Stainless GP100 .357 magnum
4" Ruger Redhawk .44 magnum
I prefer Ruger revolvers, but I don't have a favorite autoloader brand.
I like Sigs, HKs, Glocks, Berettas, Springfield XDs, and CZs. Haven't tried and S&Ws autoloaders, but I'm sure that I'd like them just fine. Ruger SR9s are very sweet shooters, but I don't plan on getting one for a while.
If I had to choose one brand for autoloaders, I would probably go with Springfield XD models. They are reasonably priced, reliable, durable and accurate. The second brand that I would choose would be glock.