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Agree with the other Firefly fans - Adam Baldwin would've been good apart from the age. Nathan Fillion would be great apart from being in Castle. Likewise they've commissioned a new series of Burn Notice, so Jeffrey Donovan is out of the picture. 

How about Wil Wheaton? ;)

James Denton who played Mike Delfino in Desperate Housewives? (Dammit - he's going to be 50 this year)

Jason O'Mara from Terra Nova? (Never seen it, but heard good things and it's been cancelled ;) )