As far as their needs in free agency, they’re the same as the draft. The Texans need a pass rusher or two, preferably an end.
Because Williams is comfortable on the right side, undersized ends don’t fit their needs. They need an end who can play over the tight end and rush from the left side.
http://www.chron.com/disp/story.mpl/sports/6245451.html
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In this Chron article, John McClain comments about Texan FA/Draft priorities. All I can say is I hope this isn't true because it seems such a waste to make weakside and not strongside DE as Marios starting/regular position.
DEs with his size and strength who still have the quicks to rush from the edge and thereby be 3-down players on the strongside are few and far between. On the other hand there's a much larger population of the smaller variety (245-260 range) to choose from who can play the weakside where they don't need the size to contend with double-teams from the TE.