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...Robinson and Wells are far from a sure thing. I would, however, say that I'd rather keep Carp on the field if I can, simply because I think you can buy your DH and have him be a better hitter. Even if you do buy Willingham...his defense is poor enough IMHO that I'd rather have Carp do the outfield work.
For undervalued second-tier DH candidates...Willingham would have to be on your list to consider though if we can't get a big bat in trade.