what changes were there between 2007 and 2008 model years

Go for a Diesel, twin turbo if possible (3.0sd or 35d badge). inner edge of rear tyres will scrub, worse the bigger the wheels. keep pressures at 40psi to minimise the issue. Look at replacing the battery (have a dealer ensure it is correct size for car and register it in the engine computer) also look at replacement of the PCV valve and Airfilter. Other than that they are not bad rides.