I took Spurs on the futures at the start of the season, and see no reason to hedge my bet here on the Pistons.
Like Naught said, Spurs have a deep bench, but what makes me really confident has been the form of the role players such as Horry and Barry, especially against the Suns. They shooting the lights out in that series and on top of Manu and Parker's speed advantage over Rip and Billups I really like the Spurs to dominate.
Oh and one more thing, it helps when the have the best player in the league, Tim Duncan. I'm banking on this legend to make it happen for the Spurs
