If you wanted one that is easy to use, then surely the Tom Tom would be the way to go?
Morgan Computers have the Tomtom One at £59.99 and the Go 520 at £89.99 (both Ex VAT)
Or they have the Navman N60i, with European maps for £99.99, I have a Navman ICN510 and it is great, aparet from the 5 digit postcode issue (which is not an issue with the N60i, as it does 8 digit postcodes.)