Clutchmasters makes a good product. Unless you are constantly launching the car or planning on custom forced induction of some type, the stock clutch should be fine. Just ordered a Luk clutch at 92k for my e90. $250 shipped.
'07 328i 6spd MT - Sport Package - H&R Sport Cup Kit - TMS 10mm/20mm Spacers- AA Tune - K&N - TMS Cross Drilled Rotors - Axxis MM Pads