I expect Suppan to keep performing at his current level. He'll have some bad games and some solid ones, and should win around 12-13 games. If he's helped you so far, stick with him unless you have better options. A trade could significantly change his value, of course, but I'm not hearing anything definte.
I was never very high on Byrd, but he's proved me wrong so far and put together a very nice season. I wouldn't drop him unless your league is very shallow.
Driskill's out-of-nowhere rookie season is a great story, but I don't think he'll be able to keep it up. Look elsewhere if possible.