This isn't a contest for best receiver, this is for receiving cores.
Best and Megatron are good; however, so were Andre Johnson and Steve Slaton a few seasons ago. Doesn't mean they were better than the Cardinals that season.
The league has really become a league full of great receiving cores. Just in the NFC alone I'd say Dallas, New York, Philly, Green Bay, Minnesota, and New Orleans all have good to great receivers.