Man I want one of these

Sigma just released a new lens that has me drooling. It is a 120-300mm 2.8 optically stabilized zoom.

Its a big heavy lens but it would be perfect for shooting trackside at motorsports events. It is way out of my price range though. I am going to see if I can't rent one for when I go to the 24 hour race at the nurburgring. Im going to need some fast glass with some reach and this fits the bill.