Check out
http://www.shars.com . I have their 4" vise and it's quite nice, but if I were buying a vise today I would get the 5" (which is slightly shorter than the 4" vise and has a longer opening).
5" toolmakers vise.
Oh man, looks like that vise is out of stock, I wonder how long it'll be before they get some more.
Here's a 4.5" vise It's $2 less, the jaws are taller (by an eighth of an inch), and it doesn't open as wide, but it's
in stock.
Most of the parallel sets I've found are sized by the eighth inch (I mean, going from one size to the next means an increase of 0.125" in height). Because of this, I would buy a vise with a jaw depth that is
not divisible by 0.125 (in other words: get a vise with a jaw depth of 1-
X/16" where "
X" is an odd number).