Can't do Return to Tomb of Horrors, they got rid of all the cool save or die stuff (and even the no save and die stuff)...
I think a good one would be to do a combo Return to the Sentinal and Gauntlet (not very catchy, but two good adventures which are linked)
Giant series would work well with the new system.
Return to Bone Hill/Assasins Knot would be good too, put the skill check and trap mechanisms through their paces.
Reverse the antagonist and have a Dragonborn party in Return to the Cult of the Reptile God.
Return to the Desert of Desolation (Make it a grand module and include the rest of the I series in there)
Return of the Slavers (what's this; points of light campaign world, minions, skill checks, trap xp, this one has to be done by someone)