Other than the Vaquero cosmetically resembles a SAA, they BH and Vaquero don't have much in common with the Colt SAA other than they are both single actions.
The finest SAA style gun I've ever shot or handled was a USFA.
If we are to include all single action type revolvers (ones that aren't Colt clones as well) you aren't going to beat the quality fit and finish of a Freedom Arms in an out of the box factory revolver. I've got an Interearms Virginian Dragoon that I'd give an honorable mention to as well, but still it's not up to Freedom Arms standards.
The Rugers are solid values though, but aren't in the same league with USFA or Freedom Arms IMO.