I've always had a passing interest in single-actions, but I'd never handled one before, and the gun merchant was showing the Single-Six to some other customers, so I asked to handle it before he put it away. It balanced so absolutely perfectly in my hand that it felt like an extension of my arm. I barely noticed the weight. Didn't fatigue my wrist at all to hold it at arm's length, and I have weak, skinny wrists. I'm not sure how long the barrel was, probably either 6.5" or 7.5", but either way I'm pretty sure that's part of what made it balance so well. And I tend to not like longer-barreled revolvers because of my aforementioned weak, skinny wrists.
I've joined a gym and have started working out, fear not.
Anyways, I want the Rugers because they're more practical thanks to the transfer-bar safety and sights that are actually visible and usable (though I'll probably replace the black blade front sight with a fiber optic or gold dot), but I want the replica Peacemaker (I'm leaning Uberti too) because like you said, it has that old-world class to it.