I would recommend "Record" brand bench vices. I do not know if you are in Canada but canadian tire sells them. If you are not in a hurry they do go on sale for a significant discount. We use them at work and they take a good beating without the acme screw stripping.
On a small vise you will not likely need a lot of pressure betweent he jaws, but beware of poor quality if you have any expectation of doing more than very light work.