Beltran, Boesch, Willingham, or Young?

I know it's probably a bit late to be asking fantasy baseball questions on Yahoo! Answers these days, but considering my team is going to be in my league's playoffs next week, I gotta ask anyways.

So, heading into the playoffs, I'm looking pretty solid. This is especially the case with my OF. I've got Kemp, Crawford, Holliday, Upton, Alex Gordon, Franceur, Cuddyer, Mike Carp and Drew Stubbs on my team and able to start (Note: 10 team league). My weakest link is Chris Young. Yeah, he has 17 HRs, 57 RBIs, and 18 SB...but he has a .232 AVG (.119 in the last month), by far the worst of my team, and I have hardly used him in the past few weeks.

I'm thinking of dropping Young, but I don't know for whom. These are currently my top three options:

a. Carlos Beltran: .284, 15 HR, 68 RBI, 65 R, 3 SB

b. Josh Willingham: .249, 22 HR, 73 RBI, 52 R, 4 SB (really hot, but I don't know if it will last)

c. Brennan Boesch: .285, 16 HR, 54 RBI, 74 R, 5 SB

So, what should I do? Who should I pick up? Or is Young still my best option? I would really appreciate your answer!