I need to pick up a good closer here are the guys im looking at:?

I wouldn't drop Rodney or Valverde. I don't think any of the guys on your list are better than them. Rodney has been hot and Valverde is a pretty good RP who will probably get it together. Downs gets a lot of Ks and may replace Ryan if he stumbles. So Howell is who I'd cut. I'd probably go with either Sherrill or Lindstrom.