De Leon would be a terrific fight while it lasted but since he's with Golden Girl,that isn't happening.Probably Garcia unless Arum feels that Cabalero would be the easier way to the title. Salido needs a good long rest,though.
Any of them would be good fights. I'd be surprised if Arum matched Garcia with him just yet, and obviously John seems unlikely to fight a threatening opponent any time soon. I voted Gonzalez/Rojas as that would be a fairly big fight in Mexico if Gonzalez wins and a good HBO/Showtime co-feature if Rojas wins. Ponce De Leon would also be fun. Basically Salido vs any good featherweight apart from Gamboa will be good.
Hopefully Garcia, Salido should be a real test for Garcia If this doesn't happen I have feeling Arum might throw JuanMa to Garcia.