My list would be:
PG: Kidd/Nash/Billups - Jason Kidd has a winning pedigree, and is just a terrific all-around point guard. I think a two-time MVP (Nash) deserves a place on this list, as well, despite not winning a championship. (And let's face it... he was raped over and over again by the officials. No other superstar has to fight that hard to get fouls). Billups doesn't particularly impress me, but championships speak loud, so he edges CP3 for me. For now. I think CP3 is a better player, but he still has room to grow.
SG: Kobe/Wade/Manu - Kobe and D-Wade are obvious. I honestly had a hard time thinking of a third great shooting guard. T-Mac is the eternal "What if...?" guy, as in "What if T-Mac didn't get hurt and miss half of every single season?" I can't put that on this list, although I think he could have (should have?) been an all-time great. I thought about a few other guys, but to me, Manu Ginobili has been the most consistent, reliable, and overlooked shooting guard for the last ten years. He has helped his team win championships, and has a sixth man ever been so important to his team? Ever? I can't think of one. He's just a quiet game changer; although I dislike him a bit myself, I can't deny his resumé.
SF: LeBron/Pierce/Melo - The King. Duh. Pierce has been quietly busting his ass all decade trying to keep the Celtics in the running, and is really a great clutch player. He's a leader, and has a championship under his belt. Definitely one of the best players this decade. For the third spot, I really wanted to put Grant Hill, but I already decided I wouldn't put any "What if...?" guys in there. Just remember that he was the best at one point, and is still grossly underrated as a player in this league. I don't really think of VC as a true small forward, so I elected not to put him here. Ray Allen crossed my mind, but again, not sure if I can call him a small forward, even though he has played the position a lot. As far as true small forwards go, I had to stick with Carmelo. He's a great scorer, and if he ever "grows up," he'll be untouchable. Still has a lot of untapped upside.
PF: Duncan/Amar'e/Nowitzki - Hard not to put Ol' Reliable at #1 here. Duncan is one of the best of all time (if not THE best at the 4). Had a hard time with the other three spots, because KG/Amar'e/Dirk are all so good. It's also tricky because they don't always play the 4, because of their teams' needs. I elected to put Amar'e here because he is just a dominant player when he turns it on (and it's usually turned on whenever he's on the court and getting touches). Watch the Suns with and without Stoudemire in the lineup, and you get a feel for just how good he is. I put Dirk above KG for two reasons; 1) KG has only been on one good team the last ten years (last year is an anomaly due to his late injury). Granted, he played in basketball Hell, but Dallas wasn't any good for a few of their winning seasons either, aside from Dirk. 2) Dirk is just a unique player. KG is a great defender and post scorer, but Dirk can defend and basically play positions 1-5. He has ridiculous range, great mobility, and is just a truly different kind of PF. KG is just a little too much like every other PF to shove Nowitzki off my list. (Honorable mention to Rasheed Wallace, as well).
C: Shaq/Yao/Mutombo - Shaq is the most dominant player of his generation. Yao is still a freak among freaks, and changes games by his sheer presence. He could be truly exceptional if he weren't injured so often. For the third spot... it's hard to really pick someone out. There haven't been a lot of great true centers aside from Shaq and Yao. So, I decided to say Deke. The next ten years will be all D12, but he just hasn't shown me enough yet. Still extremely raw on the offensive end, and should have taken some lessons from Gortat on how to take charges and not foul so much on the other side. As for Mt. Mutombo, there's a reason he has a nickname like that. He's one of the most memorable, genuine players out there, and has been a presence in the paint his entire career. It's a relatively thin crop, but he stood out to me.