Associate
Or TT or R (I don't say R8 because if this R4 that someone was banging on about before actually makes it to production [which it's guessed it won't because it'd drag lots of sales from the Boxter at the price point it was going for; edit: this was wrong -- apparently it's going to share a platform with a new entry-level Porsche... massive WIN] I'd potentially buy one).The only sporty cars Audi do start with RS and sometimes an just an S. Anything else and it's like people speccing a 330i Sport/Focus Zetec and trying to claim its sporty.
Funny story, I saw an R8 parked up outside Kwik Fit on Fountainbridge the other day, I pray that it belongs to the manager (but I doubt he would make that much money?) otherwise... jesus.
I hate how the word "sporty" is banded around for cars. A 2.0 TDI S-Line is NOT sporty, no one is ever going to race one of those in motorSPORT. Although haha funny if you were being sarcastic...I think I would class my 2.0tdi s-line as sporty also...

Since both the E class Coupe and C class coupe occupy the same market space and effectively compete with each other.