A good place to start is here, click on the buyer's guide which I co wrote back in 1998
www.mbcoupes.com <---- see the buyers guide there.
The 560SEL sedans were sold in the USA for the 1996 through 1991 model years
They can be a fantastic bargain if you get a good one nowadays because of their great appetite for (premium)fuel.
They look best in the dark metallic colors such as blue, black and red
Good luck in the hunt.
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1991 560 SEC AMG, 199k <---- 300 hp 10:1 ECE euro HV ...
1995 E 420, 170k "The Red Plum" (sold)
2015 BMW 535i xdrive awd
Stage 1 DINAN, 6k, <----364 hp
1967 Mercury Cougar, 49k
2013 Jaguar XF, 20k <----340 hp Supercharged, All Wheel Drive
(sold)