Looking for purchase advice 2013 S550

First is Lunar Blue on Cashmere/Savannah with DA, Pano, Heated Wheel, Rear Seat Pkg, Rear blinds, 20k CPO until 11/17
Second is Black on Cashmere/Savannah with DA, Pano, Heated Wheel, Illuminated Sills, 18k CPO until 5/18
Both offered me the car for $60k. I'd love to get opinions on a couple items:
1. Does the price sound fair?
2. Should the warranty difference be a consideration? (I typically keep a car 2.5-3 years)
3. Any thoughts on the rear seat pkg? Sounds fun, but generally useless as my 2 Jack Russells are the only ones ever in the back!
Thanks for any advice.
It starts when the cars original 4 year/48k ends, so a 13 should have a decent amount remaining.
On the car, I'd find a 12. It's going to have everything the 13 has. In 11 the Drivers Assist became standard and of course the 12 got the TTV8 engine. Power rear sunshades became standard in 2010 provided the car has at least a P1 package and I've never seen one that doesn't.
A real find and something I wish I'd gotten was a car with the Bang & Olfsen sound system. Those will have silver door speaker grilled and funky looking door tweeters. The base system blows. That B/O package was standard on the 11 and up S600 and a rare option on the 550. Of course the S600 TTV12 nullified the advantage of the 12's engine upgrade, so an 11 600 might also be a smart CPO play. Not to mention the full leather interior and other goodies.
12s have depreciated out a good bit. Probably save you $10k on a 550 vs 12.

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