Choosing a vise

I need to purchase a milling vise (4" or 5", hopefully <$150) to use on a recently acquired Jet JMD-18. I'm finding there are options that include a 360* swivel base, and others that don't. To my untrained eye, the vises on either option look the same, i.e., a regular vise just bolted to a swivel base.

My question, is there any value to getting the swivel base option, or should I just go for a fixed base vise?
I have a swivel base on My vice, most of the time the base lives on the shelf, I have it on the mill currently but I can live without it and for the guys with the smaller mills it eats +/- 1 1/2" of vertical work envelope....
 
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I was just up your way today at our cabin in Dingmans ferry.

Cold!
 
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