Any particular reason why you need to get the ML500 versus the ML350 (towing, heavy hauling, etc.)? A steep price hike for the additional cylinders in the wake of climbing fuel costs, IMHO.
I checked
www.MBUSA.com for their option package costs, and the "gee-whiz" options that include the parktronic and keyless go are a pretty penny!
Consider that $63K would get you in a moderately equipped GL450.
I mention all of this since I just got my '07 ML350 a week ago for about $15K less than that out the door...with decent options as well. Premium sound package, navigation and satellite radio, as well as the appearance and sport packages.