deciding on a used car is tough, but are you paying cash or financing?

a 5 year old car will not get the same terms as a 1-2 year old car... (i.e., a 5 year old lexus will cost you more monthly than a 2 year old lexus in payments).

Out of the ones you listed...the Lexus GS300. May also want to look at a 2008 Pontiac G8 GT.... but i am biased.

Charles