I'd say the Pistons. Their starters are about the most consistent in the NBA and I'd venture to say Rodney Stuckey is probably going to have a pretty big year in a 6th man role for that team as well. The Suns are damn good too. Nash and Bell are both very good starters and Barbosa is money off the bench.
To answer the question, I think its Detroit. They've had a rock-solid starting backcourt for a long time, and Stuckey will be one of the league's best subs this year.
Suns aren't too bad with Nash, Bell, and Barbosa. Spurs with Tony and Manu. Pistons with Billups, Hamilton, Stuckey, Hunter, and Afflalo. Cavs now with Mo Williams, Boobie Gibson, and Delonte. Boston with Ray Ray, Rondo, Pierce (when he plays SG), Tony Allen, Cassel, and House. Lakers with Fish, Farmar, and Kobe. Ok I'll stop.