My current cowboy battery includes:
2 Ruger 50th Anniversary Flat-Top .357s, tuned by Cylinder & Slide Shop (I usually shoot Modern)
1 Navy Arms/Puma .357 1892 WInchester clone, tuned by Steve Young at Steve's Gunz
1 1897 Winchester clone from Coyote Cap Gunworks
Alternately, if I shoot Traditional, I use two Ruger Vaqueros in .44 Mag/.44 Special and an out-of-the-box Marlin .44 Magnum lever gun that's as creaky as an old Dodge truck. The Rugers are indeed tanks. Long Hunter turned up my Sweetie's .32 H&R Ruger Single Sixes, and he did a sweet, sweet job. Can't recommend him highly enough as a gun mechanic. I like the .357s because ammo is much cheaper and I usually have tons of it around. I like the .44 because I just like .44s...when I shoot 'em, I'm usually the only person at the match running .44 Specials....so there!
I'd take Marshal's advice, though...he's better than me...
Michael B