I put Centric Premium rotors on the front of my 4.8 and they work great. Paid about $150 per rotor. If you get them delivered, make sure to check them carefully for shipping damage to the edges as they are really heavy and tend to get dropped by the UPS guy.

__________________
'06 X5 4.8is, TiAg/black, cold weather pkg., comfort seats
'07 750Li, TiAg/black, sport pkg.
'05 Ford F350 silver met./slate gray, Lariat, 6.0 PSD, CC, DRW, FX4