Buy on condition not mileage and don't be afraid to buy a modded one. Personally sold mine at the start of January, and I can't fault them as cars I'd have another in a heartbeat. Sabre are at the forefront of live mapping them ATM, with silly results from very little mods 350bhp is easily gained for not a lot of money.
Get yourself in the mk1 frs room on rsoc a lot of very friendly, very knowledgable people.