the problem with the lexus, is that although "they go on for ever", if you buy a 100K+ mileage one, then give it a proper service, change all the fluids, replace the 'dodgy' bits like cam belt, waterpump, fan belt, brake pads, plugs, HT leads, dist caps and rotor arms, filters, etc. etc, that'll cost you about 2 grand! (well, it did me) if you were to do the same with an omega it would cost about half that. so, unless the seller is an extremely reliable and known person, the risk could be expensive. i think that any LS400 over 8 years old is worth what the buyer wants to pay. one with all the service mechanics replaced, and everything working, is probably worth 6K, if it's below about 175k miles.