I pick one of either Andre Johnson, Larry Fitzgerald and Wes Welker.
Yes, Wes Welker, check the stats. He's not a huge play maker, but him and Brady will eat you alive with little quick slants over the middle. He had 86 catches last year and from '07-'09 caught over 110 passes each year. In '09 he caught 123 passes in 14 games.
I'm not picking Welker as the best, just presenting his case for anyone who might not consider him worthy.