Need guard help: which two would you go with? = Mario Chalmers, JJ Barea, Kyle Lowry, Jason Williams....?

I really like your big men, but there is no good guards avaible I would tried to make a trade. Elton Brand is not having the best year but is a big name try trade him and ...(Barea, Jianlian, Chalmers...) for a realy good guard.