Single action revolvers are great guns be it for a first, fifth or fiftieth purchase. Not a common choice but certainly as valid as any other. If that's what you like then welcome to the wheelgun club
Fixed or adjustable sights?
If you know for a fact that you will go with ONE load then fixed sight guns are great and have that classic look moreso than the adjustable sight models. But if you want to tinker with your ammo and try different weight bullets and load powers then really there is only one option that works and that's a Ruger Blackhawk.
If you are fine with one load and one bullet weight then it opens up a bunch of options from Ruger, Uberti, Pietta and Chapparal.
Of the four brands Ruger, Uberti and Pietta are all top notch. I've got a couple of Uberti and a couple of Pietta and there's little to wish for between either and all of them have been 100% reliable so far with hundreds of rounds through the cap and ball Ubertis and between 2500 to 3000 through the cartridge Piettas.
Ruger's New Vaquero is a lovely gun. But it's only SAA on the outside. The action is more modern. On the other hand the Uberti, Pietta and Chapparal guns are faithful to the old Colt action design.
On the Rugers you lock out the hammer and unlatch the cylinder bolt when you open the loading gate for loading. With the others you go to half #### to retract the cylinder bolt and then the cylinder can be indexed and loaded through the gate.
One thing in favour of the old classic way is that when you index and draw back against the hand on the old style action you can literally lay the round in the gate and let it slide forward into the chamber. On the Rugers you can't do this and you have to hold it in place more precisely.
Finally there's the choice of caliber. If you don't reload the only decently economical ammo is .38Spl. If you do reload then the options are wide open since the difference in cost from .38Spl to .45 Colt and any of the others in between is minor and is all in the cost of the bullets themselves.
The fixed sight cartridge guns will also come to you with the front sight too high. The intent is that you are supposed to settle on a load power and then file down the sight to match the sights to the point of impact. Obviously this is something you want to sneak up towards and do in stages since it's pretty hard to put metal back on. You also want to pick your gripping style since holding the guns one handed and two makes a small but noticable difference in the point of impact.