With working for audi i see a huge variation in tyres. Some of the best have to be the Pirelli Pzero, Goodyear Eagle F1, Continental Sport Contact 2, Michelin Pilot Sport, Bridgestone Potenza, Yokohama Parada.
I currently have Pirelli Pzero's on my LCR and having only had it a few days found them to be good, but on my dads car he has Michelin Pilot sports (audi a5) and i drive it all the time and have yet to lose traction.
On my last car i chose to go with Yokohama Parada, and apart from being so soft and wearing quick they were awesome tyres.
I was also told about having pressures at 29/26 by the guy i bought the car from. it made about 8000 miles difference.