It pretty much has to be Mervis with a fresh start at 1B coming back from the All-Star break, right? Send Young back down, recall Mervis, and let him start 4-5 games/week with Mancini getting a few games against lefties. Nobody else is giving the Cubs any production at 1B, so (barring a trade) they have nothing to lose by giving Mervis the second half of the season.