Wilton 6 in, not the cheap homegrade import wilton models. Your Yost included... Not beefy enough.. Not ductile, made in china... With a good old school vise Name... and Name only,,
Swivel is VERY handy... Kurt and similar machine vises, do not have a deep enough throat for general gunsmith work. And taking a torch/welder near them is not a good thing..
You should consider only made in US ones with rounded edges like this :
Tradesman 6-1/2? Round Channel Vise with Swivel Base
Not the Squared homegrades Sears sells..
The sealed construction models are overkill/$$ for gunsmithing, but if you find a used one............
Will take all the use/abuse a 1911 smith can dish out.. Without breaking, getting loose.
USE NO CHEATERS ON VISE HANDLES... Anything can be broken/bent by DUHHHH.
Having a chinese vise break in two, when tightening handle with normal pressure, cures you of chinese vises
Have watched neighbors springy chinese POS, pop parts out of jaws, doing just light work..
A Wilton will be over 500.00 You will not need to replace it.. 1760 has served me well. Current model is 1765
The 600S model is just too much $$ new and only ~3 lbs heavier.
If you can find used ones in good shape, go that route.
Next problem will be a stout enough bench to mount it on..