Have to agree with Ows ,Jonny Boy and Trebor VR6, the engine will go on for the best part of forever, forget the mileage, and the price is definitely too high.
The only thing you'll get out of paying this price is a warranty on an engine that won't need replacing.
Go private, you'll find the same car, cheaper with lower mileage, and have the knowledge it can't have been thrashed (on the basis that I have yet to meet anyone who has manged to 'thrash' a V engiine). Autotrader is the best bet, but check ebay, you never know what might come up.
Happy hunting
Tonic