Two 09s I am looking at, both with excellent service records:
1) 184k, nav, heated seats, premium plus pkg, tow, 18" liq graphite, two sets of wheels and almost new tires on both, snows and regular. The snows are useful to me. $10k
2) 148k, nav, pebble beach, heated seats $10k

What do you think? Too many miles? I do my own maintenance so I fix most things that go wrong. Also have an LS with 183K trouble free miles.

 

These cars are still going strong at 200K and beyond. So if the service records show they were taken care of, then either one would should be fine.

 

High mileage is irrelevant to this generation of Lexus. You will find many posters who have gone 300-400k on their RX on the original engine and transmission.

I would go with the one that is cosmetically in better condition and that can be had at a lower price after negotiations.