Sheed will get more than the MLE if he wants it. He'll have to go to a noncontender, however (which includes resigning with Detroit). And yes, he would be my top choice if he can be had with the MLE.
Marion, Artest, Millsap and Kidd can get more than the MLE too.
The best of the others: Anthony Parker, Lamar Odom, Grant Hill, Jamario Moon, Aaron Gray, Jason Maxiell, Antonio McDyess, Rasho Nesterovic, Luc Mbah a Moute, Ramon Sessions, Za Za Pachulia, Gerald Green (for old times sake), Darius Miles (ditto), Kevin Ollie (future coach), Joe Smith, Bobby Jackson.
Guys I would stay away from: Drew Gooden (headcase), Ben Gordon (gunner), Tyronn Lue (blah), Flip Murray (gunner), Jamal Magliore (finished), Adonal Foyle (finished), Antoine Walker (finished), Damon Stoudamire (finished), Steve Francis (finished), Shaun Livingston (still can't walk), JR Smith (gunner), Anthony Carter (never wins), Juwan Howard (finished), Chris Wilcox (head case),Desmond Mason (bad fit, can't shoot), Robert Swift (skinhead), Marcus Williams (slow, can't defend), Trevor Ariza (punk), Chris Mihm (finished?), Matt Barnes (punk).
The Celtics also have to deal with their own free agents: Davis and Powe, plus be prepared to match a fat offer sheet on Rondo.