Three good options to choose from. Personally, I'd likely go with the Renzetti Traveler, just from my customer experience with Renzetti (excellent), although Griffin also has good customer service.  Also, the Griffin BMV uses the same locking system as found on their basic 2A vise, and that is surprisingly versatile (I've tied size 22 and size 2/0 on that vise!).  Whatever you go with, get the pedestal base model!

Although the Nor-Vice may be out of your price range, it is an outstanding piece of equipment.  It certainly has a learning curve, but is well worth the time and effort.