he was pitching pretty well, then he somewhat imploded behind some terrible defense in a five run 6th. 6 runs, 2 earned. he's generally hexed the days. he either pitches like crap or catches no breaks. he's still striking out an alarmingly low number of hitters (2 BB, 1K today) so realistically, his stuff isn't really that great. now, i know it isn't all about strikeouts. inducing 27 ground ball outs is likely to be more economical than striking out 12 batters, but nevertheless, buehrle doesn't look like he's going to warrant a roster spot on most teams throughout the season. hell, i just dropped him for dontrell willis in one league (my starting pitching is so solid that buehrle isn't a fixture), so really, it's up on you. if you're having faith i nthe guy and think he can still end up with 12-13 wins, then go for it. he's likely a FA in your league or can be had for real cheap... but if you dig up my old long-winded post comparing him to glavine, you'll see that buehrle has been consistently worsening as a pitcher, and it doesnt look like he'll ever have a chance of winning 15 games again, unless he pulls out some aaron sele years where he's like 15-10 with a 4.36 era or something.
colon looks like hte guy you want off of hte white sox staff. from there, it's a better bet to find other young arms like randy wolf, brett myers, mark prior (duh), carlos zambrano, ted lilly, etc etc.