I'm still pretty sure it would be something like Youkilis, Bowden/Lester, WMP, plus one other player.
I think Texas will (and should) want Lester, as he is more developed and could potentially add to their team this year. Despite your talking about WMP as a "throw in" he is certainly an intreguing throw in with the potential to hit 25 hr (he averages that per 162 games). He's a very similar player to Marcus Thames. They share 25+ HR power, lots of K's, low average, .311 OBPs, high .400s SLGs. I think if the Tigers made a deal they would be okay with dealing Thames but also that another team would find him useful.
All this talk of WMP being a worthless pile of garbage we WANT to get rid of is absurd. I can think of a few roster spots on the Yankees that he could take, and which the Yankees would certainly give to him. I can think of a lot of teams that wouldn't mind having a player who can play all three OF positions and hit the ball like WMP does. He simply needs regular at bats to see what he can do. 127 is simply not enough, but last year he had an .840 OPS when given playing time. Not bad for a guy who people would happily drop from this team. He's trade bait for a reason.