Fault Code Reader

Hi,

Ive got an ECU light on my dashboard, had the fault diagnosed a few months ago (coolant temp sensor fault) - when car was in for a different fault - and havnt yet got round to get this sorted out.

When was last diagnosed the garaged mentioned a few other faults showing up as well so before I go and get it sorted out i'd like to double check myself again now to make sure the faults are still the same rather than paying for another diagnostic test. I know eventually I'll need to pay for the diag when the car goes in for repair anyway but I'd just like to know what sort of cost i'll be looking at and how urgent the repair is needed - judging on the fact the light has been on and off for about 9 months without causing any major problems other than a little extra in fuel consumption.

Anyway.. what im getting at, whats the best DIY handheld fault code reader to buy (assuming I dont know a great deal about auto electrics) for under about £60 and also what is the difference between one that shows 'live data' and one that doesnt?

FYI car is a SKODA Fabia Classic Estate 1.2 2003.

Cheers