This trade is definitely contingent on your depth at WR. If you need a WR, i actually think Colston is heating up big time. The Saints are finding that their offense moves much better when they find the big guy, which shouldnt be a surprise. however, with the emergence of woodhead im concerned about BJGE's ability to produce consistently. Same with Moss coming to town for Washington, though that could boost his stock too, though its not clear yet.
If you really need depth bad at WR, and given Turner's somewhat disappointing season, this is a risky but potentially rewarding trade. You should be in pretty bad trouble at WR though, otherwise i wouldnt.