You can use ANY GPS that allows you to hook up to a PC, mine is a Garmin eTrek venture which cost £120 from the Tottenham Court |Road! Dont go buying anything flash and expensive unless you are going to use the GPS in isolation and want the features.
I have Navbox Pro myself and it isnt a bad little package. We did a 'test run' with it from Bournemouth to L2K and found it was very accurate on the positioning given on the screen. I would reccommend it.