Just an update:
The new Mercedes is working out wonderfully. It's not as fast (which I guess is good...no more speeding tickets), but the seats are AMAZING. My friends always want me to drive now...they say sitting in the back is like sitting on a full-sized couch (I have the extra seating package). Best decision that I've ever made. In hindsight, the only thing I would have done was go for the S55 AMG, but it's a hair too pricey.