I really like the look of the OEM 20" RS6 wheels:

V spokes are 9j and et 26
RS6's are 9.5j and et 21
My maths tells me this would put them 1mm further in towards the suspension and 11mm further out into the arch.
This sounds good to me, i know people put 10mm spacers on ok.
What i was wondering about is tyres. Should i stick with 265 or go 275 as the rime are half inch wider? I don't want the stretched look and would like to offer the rims the best curb protection i can.