Very good advice all round. On the point of your last sentence though:
I've found a 13.5" Stumpjumper M2 in green, 1998, with some mods: "1998 Z1 BAM forks, Magura race lines, mavic D521 rear rim with XT/LX 9 speed"
200 quid. Pics look nice. Says it's been stored in the dry and nothing...