I'll admit that I'm not all that involved with budget leagues, so take my picks with a bit of a grain of salt. But I'd go...
Clay Buchholz - $4 for him is a steal if her remains healthy
James Shields - very reliable and will get you Ks
Josh Donaldson - good price at a shallow position, worth a shot for the production he provided this year
It's tough to pass up on Shelby Miller and Matt Moore at those prices. I don't like Brown, even at $4... and especially since you already have a full OF.
Here's my keeper questions if you have a chance: viewtopic.php?f=26&t=464237