@WilliamR after much thought, I think I should ask: are you interested in the best, multipurpose, fastest, most rigid vise? If you can compromise speed and multipurpose - just a little- I have another suggestion for you to consider. [those in the know will tell you the I love to complicate every decision
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Consider a 5" or 6" screwless vise. Even the very cheap ones will be a lot better than middle-of-the-road milling vises...
This is NOT an endorsement, but an example of one:
JAW WIDTH: 6". Jaw height : 2". JAW OPENING: 8". HARDENED AND PRECISION GROUND.
www.ebay.com
They stick out way less on the column side of the table, and are very rigid and repeatable. A Kurt, they are not. But a workable solution on a budget that are a little slower to use, they are.
[update]
Some forums have strongly discouraged the use of screwless vises for milling, You should read them, but one misconception: they can grip just as strong as any milling vise, if used correctly. Thye grip properly if the screw angle is used correctly. Many guys aren't careful.
I use my Autowell and my Kurt for day-to-day. I could have gone screwless, but I like the speed and convenience.