Suns Trade: Steve Nash (S&T), something like $20m for 2 years
Receive: Darren Collison, Tyler Hansbrough, Pacers lotto protected future 1st

Grizzlies Trade: Mike Conley
Receive: Steve Nash

Pacers Trade: Darren Collison, Tyler Hansbrough, Lotto protected future 1st
Receive: Mike Conley

Why for:
Suns : If they can't add pieces around Nash, the best thing they could do is get value for him.
Grizzlies : With their cap situation there are no other ways of really upgrading their talent. Adding Nash next to Gay/Randolph/Gasol could turn them into true contenders.
Pacers : Get a defensive minded point guard who is still young and fits their young core of players.

Our new rotation:
Conley/Hill
George/Hill (or FA)
Granger/Jones
West/FA
Hibbert/FA

Why is Conley at least as good as an option as Nash?
Because Nash is 38 and would have a 2 year contract. This team+Nash would be huge, but would it really be good enough to beat the Heat and the Bulls? I don't know. What I do know is that after these 2 years we'd have nothing as Nash will retire.
With Conley, we get a good point guard who knows how to play defense, has shown he can be a starting point guard for a playoffs team, is young (will be 25 next season), and has a looong contract.