I think I'd like to get a #1 or #1-2 WR and move Tate to the slot, and let him compete with Baldwin. All around depth would be improved quite a bit.
Rice is a true starting WR, whether he is #1 or #2 I keep him at least another year since we look pretty good in terms of cap room next year. Remember, he's only 14 months older than Bruce Irvin, so he could finish his contract right at his prime, unlike most big free agent signings. Injuries worry me, but that's it.
Tate is coming around this year, but he still isn't the kind of starting WR coaches go to bed dreaming of. IMO, his skillset is more suited to the imagined Tavon Austin role than a normal starting WR. Not as fast, but similar RAC capability since Tate can run through contact, and Tate's ability to fight for the ball makes him a good vertical threat.
Baldwin is having a truly disappointing season, with his drops being more memorable than his catches. There's always the chance that 2011 was the aberration. I tend to believe that Baldwin will be a great slot guy for us for next year, but even if true, the way he gets up after a tackle, it seems like 1 hit could do him in.
IMO, if we picked up a starting WR, I let Tate and Baldwin fight it out in the slot, with the idea being that we need depth anyways and Tate would be worked in for certain packages no matter what happens.