As an aside, everybody in here talks like the Bills pick will be higher than the Cowboys actual pick. That is definitely not for certain(both teams are 3-5). Parcels has lost control of this team, IMO. I think you scrap this season and put Henson in there and see what he can do. Then you know what your needs will be for next season.
As for Brees, don't forget he is from Texas and if he is anything like me, he can't wait to get back here. And Dallas would be a pretty good fit. And seeing that he is a young FA, you just might be able to sign him without giving up your two first round picks.