what sort of budjet do you have? can highly recommend the current mio and tomtom models, i have the 520 and it has been simply terrific with none of the software/crashing problems of the old models (got a poorly 510 with huge software probs, and was always a bit 'buggy') the 520 seems to second guess (ina good way) how your brain works while driving, it seems to be developed by people who actually use a sat nav.The ability to get traffic info immediately via mobile phone (though this is an extra service, that you have to pay for, abt £25 a year) was the thing that clinched it for me, i have several ways to go to work,30 miles away, but i need to know within 2 minutes of setting out where the traffic is. Another handy thing of the tomtom, is that if you have the right phone model, if you receive a txt message as you are driving, it will read it out to you as you are driving, with no need to press a button on your phone or sat nav. This does vary by phone, my old sony k750i worked a treat, my current nokia 6300 will do all the services (hands free calls, data connection for traffic/speed cam updates as you are driving), but not the text message thing
A friend has a mio c320, and that is a very good piece of kit as well, the points of interest are superior to the tomtom.but it always seems as though it needs 1 button press more, bit like going to a sharp mobile phone after a nokia.
None of the units are difficult to operate, you will probably be able to 90% run all its facilities without reading the manual
In truth, if you go for a current model, there is very little that is poor out there, go and have a play with a few, and remember the sales assitant is likely to point you towards the model they have most stock of/the highest retail margin on......
Have a play with a few, and if you find one you find easiest to use, that's the one for you. They are brilliant pieces of kit, I have been camping in devon, been on an ebay mission to collect a hifi system from a village in the welsh marches that was literall a crossroads with 12 houses, and mine has never once let me down
happy shopping, personally I would wait a week or 2, as i reckon prices will drop, or have a look on ebay in a few weeks, when everyone has had their christmas credit card bills in, and look for something that seemed a good idea at the time but no longer use,to sell to raise a bit of cash, that's when i will be looking to buy a digital slr