Hi Matt,
i bought mine about 7 years ago for AUS$5K and drove it for about 12 months as a daily drive car, I then bought a another BMW and the wife wanted the V8 so she drove it for another 2 years before I bought her a more suitable shopping trolley, at which time I put the 540i in the shed to store until now (because I have the time) to devote to it to do it up again. What I'm fighting with is wether to keep it or sell it when done. Mainly because I just love this car