[HELP] What kind of vice should I look for?

[Old Minger]

Is the general consensus avoid a swivel base? I must admit I think it would be a useful feature providing it locks solid. Also I'm understanding some where between 5 & 6 inches for the jaws is a good all round size providing my bench can take the weight and spend more if I have to as it's worth it in the long run?

Thanks for all the info so far, very valuable and I'm learning a lot.

John