I think they will fall a bit more if the sellers want to get them sold, theres some cheep ones out there, with decent history eg
http://www.ebay.co.uk/itm/BMW-M5-Bla...item232758bf90
£4150 !
theres plently around the 5-7k mark, but some are forsale a long time, but without viewing cant comment why?
Another one
http://www.ebay.co.uk/itm/3210535745...84.m1423.l2649
this was up for sale 4ish months back @ £5300, right colour, history, spec, nice wheels, It was local to , and I almost viewed it, as couldnt find a sapphire i wanted!
Now it sold, then a month later was up for sale elsewhere in the country for £6999, for a bit, then sold, to the above seller, part ex'd as he says for a skyline.
he had it up for £6500 a few times, and now @ £5500, + in his add states hes spent some cash on it sorting out a few bits of body work too! andseems going by the add to have decent history.