Saw the same PHAT R on Hay St just before!
Dont know bout the best looking Merc ever made personally, but i do agree the rear end of the mk6 R is ok. Still looks a bit plain jane compared to the GTI, and will never look as cool as a mk4 mk3 or mk1.. :D
I'm pretty biased though....
Examples of better looking mercs
http://www.vwwatercooled.com.au/foru...slc_19_m-1.jpg
350 SLC Klasse
http://www.vwwatercooled.com.au/foru.../i201118-1.jpg
190 E Klasse AMG Cosworth evolution
http://www.vwwatercooled.com.au/foru...ew180128-1.jpg
S Klasse Coupe
http://tb.polygonized.com/Speedworks...m300slr_01.jpg
300 SLR Klasse
To Name a few :P