RS6's for me. A bit more common but I seen a genuine set on a grey A4 cab last night, anthracite and very nice.
 
RS6's are nice, but have been done to death - try something different I say!!

The RS6's are a very nice wheel but a bit like the Corsa/Nova's with speedlines combo!!
 
I think part of the decision depends on colour of the wheels and colour of the car. I really fancied R32 alloys in anthracite on my leon but i didnt want the lower quality and weight of reps so coloured the stock wheels.
 
My R6's are reps and are heavy but my standard 16" cupra alloys are not excatly light.....infact there pretty heavy for a small wheel.
 
its a sliver, 1.8t sport. i was swaying towards the r32s as i have the multi spoke 16s atm and dont want to go to far from OEM look. rimstyle.com also offer 225/40/18 or 225/35/18, what would you guys recomend for the profile?