First I'd hold a training camp and invite the following (assuming all players in their prime playing shape), then let them duke it out for spots on the 12- or 15-man roster:
G: Jerry West, Steve Nash, Bob Cousey, John Stockton, Pete Maravich, Drazen Petrovic, Bill Sharman, John Havlicek, Gail Goodrich, Brent Barry, Mark Price, Predrag Stojakovic, Manu Ginobili, Hidayet Turkoglu
F: Larry Bird, Kevin McHale, Dirk Nowitzki, Tom Chambers, Pau Gasol, Chris Mullin, Bill Bradley, Jerry Lucas, Toni Kukoc, Dolph Schayes, Dave Debusschere, Rick Barry, Detlef Schrempf, Andrei Kirilenko
C: George Mikan, Jack Sikma, Arvydas Sabonis, Dave Cowens, Dan Issel, Bill Walton, Mark Eaton, Rik Smits, Vlade Divac, Zydrunas Ilgauskas, David Lee, Bill Laimbeer, Alvin Adams
I think the best team might be:
G: West, Nash, Stockton, Maravich, Price
F: Bird, McHale, Lucas, Barry, Nowitzki, Mullin, Bradley, Barry
C: Sabonis, Walton