I think you need to look at the sold prices rather than the advertised ones, there are lots of people on ebay asking £5 or £6k for a 3rd gen, there is even someone asking £15k for one with a supercharger
or 12k for one with a daft paint job that must have been on there for over a year now. It makes the prices appear unrealisticly high and every other seller thinks theirs must be worth a few quid and jumps on the bandwagon, personally i wouldnt pay more than £3500k (a few quid more and your into 4th gen V8 territory) for a v8 or £1800 for a V6 and for that money i would expect something half decent. Good luck finding one but remember its a buyers market at the moment and with christmas coming up people are going to need a few quid, happy hunting