My main vise is a Versa-Vise, the original American made version of the Chinese Parrot vise. My dad used it on his workbench for 50 years of gunsmithing and I doubt I'll wear it out. The nice thing about this style of vise it that it will rotate to allow you to get your work to whatever angle is convenient for you without having to loosen any extra locks, etc. Mike Lea makes a neat adapter that you can use with the Parrot vise, or the version he sells, so that you can also rotate the vise forward and backward as well as the usual side to side. You still need a standard machinist's vise, at least 5", for heavy metal work. I have a 6" Wilton mounted on the other end of my bench for that purpose. It's necessary to have it but I use it a small fraction of the time compared to my Versa-Vise. I also have a barrel vise to use for removing breech plugs, barrels of center fire rifles, etc. It's home made from two pieces of 3/4" steel plate and four 3/4" high grade bolts. Barrel is clamped between two pieces of grooved oak. Never marks a barrel.
Tom