What purpose are you looking to get one for? Woods carry, hunting backup, Cowboy Action Shooting, etc. ?
I looked at a Beretta Stampede but chose a Uberti Cattleman over it. The Stampede has a transfer bar system whereas the Cattleman is more true to the original Colt with a firing pin on the hammer. Also, when looking at them side-by-side, the Beretta was too pretty, I couldn't see myself putting it in a holster ever, and I wanted something more than just a safe queen.
My understanding is that since Beretta owns Uberti the Stampede is still Uberti manufacture, but Beretta finished. So it might be better internally, I know for a fact they're prettier externally, but aside from the finishing and the transfer bar they're pretty much the same.
If you're looking for something in single-action, but modern, of course the Ruger Blackhawk line would be the way to go. Or the Ruger New Vaquero if you still want an "old world" look and fixed sights.