Hi Mate
Check for a red battery light during the test drive....that'll be your alternator and will be sure to ruin your weekend
First - MAKE SURE ITS GOT A WARRANTY !
There are loads of threads on here for new buyers - use the search facility above..
Also, here is the link from PH when I started looking....and good luck !
http://www.pistonheads.co.uk/gassing...0realistic%20?
Enjoy the search, thats part of the fun. Try and buy from enthusiast or a known forum car -good luck