it all depends on what your after, i went for the mileage which came to 53k, around 2 months back in black for £4200, but he had it up for £4800. the grey one looks like a good bet as its had the cambelt done, but you need to find out if it has had the waterpump changed at the same time and if there are recipts to prove this. the black one is really nice and depending on the mileage you cover 15k extra miles really doesnt equate to alot. i have also heard that from 04 onwards they dont suffer from the camshaft wear problems of the earlier models. if it where me i would go for the black one as i am currently trying to source the pieces to make mine into a FR+ with the cupra bumpers, but the front bumper alone costs £400+ painting as the didnt make the cupra r in my paint code. and the wheels are roughly £500 with tyres. let alone the leather etc!
hope this helps
jon