I've opted for the Winchester Legacy in .45LC, primarily due to price. ($325 range out the door) They have the Trapper and another model, I believe, both with shorter barrels and less capacity (9 rounds v. 12 in the Legacy) My Winchester is extremely accurate - operator error when excited on a stage at a CAS match accounts for my misses.
The real hot shooters in CAS go for the Marlin in .45 - the gun was designed for pistol-length cartridges, and thus has a shorter and smoother throw on the lever than the Winchester, which was designed for rifle-length cartridges. Marlin has easier disassembly for cleaning/maintenance, too. They go for $550 around here.
The 1873's are widely reported as great shooters and smooth also; some Rossi's have been reported as "crunchy" until they get broken in or an action job, others as just fine out of the box. As the other posters have shown, they are plenty accurate, too. No personal experience with either of these.
Get yourself a rifle and another Vaquero and join us hooligans at a CAS match; it's all about fun, and we're always eager to recruit more to the game.
"ABOGADO" - SASS #36181