One thing to keep in mind as we look at receivers. The receiver positions are not interchangeable. They are scheme specific and require different skill sets. We all recognize this with the slot, but are less inclined to differentiate with the split end and flanker positions.
Rice is our flanker. That means he lines up on the same side as the TE and is required by formation to line up off the line of scrimmage. The flanker is usually the faster and more finesse receiver. Because of the builtin cushion, he is less likely to be jammed at the LOS, but needs to have the giddy up to eat up that cushion quickly. Because of the head start running, he also tends to be the big play, downfield threat
What we a looking for is a split end. He plays opposite the TE and is required by formation to line up ON the LOS. He is frequently physically abused, and is also usually the best blocker, as he has to play the role of the TE on running plays to his side. This player is usually bigger and more physical, but the last two years we have used Golden Tate here, because even though he is small, he's our best blocking WR and most able to beat the jam because of his agility. But it's also why we had Braylon Edwards in . . . Big physical WR. This position also tends to run more slants and crosses and hooks.
So when we are looking at WR's, recognize that we are primarily looking for a split end. Size, hysicality, blocking are more important than pure speed. The ability to make the tough play in traffic.