z0sa,
I think you underrate the Suns. It's not the same team the Spurs faced last season, nor is it the same team it faced the last few playoff series before then. If your argument consists of "we beat them before, we'll beat them again" well then , no team but the Lakers will ever beat the Spurs in the playoffs. Teams change, players get better, players decline, situations become different, injuries to different teams happen, mental mistakes about staying on the bench in a fight may or may not happen. It's not as simple as saying "we owned them before in the playoffs, they can't beat us." Dallas would never have beaten the Spurs in 2006 then.
The experience argument I used for New Orleans isn't in comparison to the Spurs' experience as much as it is to say that as a team they had no playoff experience last year. Now, they know what to expect from a mental approach and style of aggressive play and how difficult it is.
Denver is also a different team. A healthy Nene is a beast. They have poise and tempo with Billups. It would be a different series. No guarantee the Nuggets beat the Spurs if both teams are healthy and face each other in a series, but I think they'd be a much bigger challenge, despite what has happened the previous couple times the two teams have met in the playoffs.
Teams get better. Teams get worse. I think it's happened in the Western Conference and with the Spurs.