Start with one that looks like it will work and go form there. Just do yourself a favor and get a little better quality than the cheapest you can find. Machined brass and a good quality $40-100 vise will last for years and years. I know, I made a cheapo last for 14 years and 1000's of jigs/flies but I wish I had a better one from the start.

I would suggest Terra rotary if you want to go a little fancier or a regular Terra, Spider rotary are also highly recommended although everything I have read tells me I would probably break one just from being too heavy handed with it and it not being all metal.