First off, the only one's I would take at 18 are Richardson for sure, and maybe Johnson. Otherwise I trade back.
If I had to take one of them, the order of my preference from most to least:
Sheldon Richardson *About my first choice in the whole draft along with S Floyd.
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Lane Johnson *Good player but not as good as his combine indicates.
C Patterson *Very good player but not an area of need for Dallas.
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Sylvester Williams *A notch below Floyd and Richardson but still a very good 3 tech in Kiffin's defense.
DJ Fluker *A power player that would IMO shore up RT for good. Would really improve running game.
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Ezekiel Ansah *Hit or miss player who scares me. Good enough physically that he might have a chance.
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B Mingo *He would have to play Ware's WDE spot to be effective. Would be the future there and a spot rusher right away.
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Alec Ogletree *There are better LB's for us in this draft, but he is talented... and risky.
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Manti Te'o *will probably be a solid MLB, but I wouldn't take him in the first.
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Jarvis Jones *Too risky medically. Would play Ware's spot eventually.