I've tried various versions, & have come to the conclusion that it depends what you want to use a particular version for. If you just want to play to see what Linux is like then I would suggest PCLinux; if you want it as a means of getting at a failed Windows system to rescue data then I would strongly reccomend Knoppix
Thanks for all the advice guys. I tried Knoppix but it wouildn't boot. Seemed to take ages going through all the setups & checks and then the message "Failed to load AGP modules" then black screen. I'll try another one.