Help buying used CL55

Hello everyone! My first post on the forum, due to me needing some help with deciding on which car to purchase. Interested in a CL55. Now I have experience with lots of friends AMGs (S65, C63, E55) etc but this will be my first. What should I look for? What to beware of? I have pinpointed two that have caught my eye. One is a 2006 with 83k miles (sadly no keyless go; really wanted that feature) or a 2004 with 79k miles. Now I have spoke to the owner of the 2004, and he said he had all service records, just replaced the front bushings/coolant flush, and also notified me it had a tune/pulley upgrade. Still awaiting response on the 06..although I definitely prefer the black interior. Anyways would the 2006 still be more reliable than the 2004 due to it being the final year of the CL55? All feedback is welcome. Oh also will attach links for both