I voted for T.O. and here's why:
The question was "Who's the best Cowboys WR since Irvin was drafted?" Not "who's done the most for the team?" or "who's been here longer?"
Let me give you a hypothetical: let's say the Cowboys draft a WR in 2004 who comes in and just lights up the record books. 18 TD's, 1600 yards, 125 receptions, blah, blah, blah. The next year he suffers an injury that ends his career. Game over. Now the question is asked. Who is the best Cowboys WR since Irvin was drafted? It's a no brainer. The kid that was on his way to smashing record upon record before being forced out of the game is the only logical answer. Was he able to play out a promising career for many seasons with the Cowboys? No. was he clearly the best thing we had seen at the position since Irvin left? Absolutely! For me, the same applies to Owens.
I, personally, can't exclude T.O. because he was under contract with another team while Glenn was signed (which seems to be the criteria for some) to play for the Cowboys. His tenure (to me) is irrelevent. T.O. is the better receiver, and he IS officially a Cowboy.
The best Cowboys WR since Irvin is Owens. Irvin would tell you the same thing.
Just to qualify my answer (as someone other than a blind T.O. homer), I hated T.O. before he came here. I'll hate him again when he leaves. In the interim, he's a Cowboy and I'll scream, shout and root for every catch and TD he produces whilst wearing the star. Other than that I could care less about the guy.
SS