How do Christians reconcile God's omnipotence with his omniscience?

If God is truly omniscient as in "all knowing", then God knows everything including the future. But doesn't this then remove his choice to do something other than the choices he takes in the future he knows of? In which case he is not omnipotent? Or conversely, if he can truly do anything because he is "all powerful", this has to make the future uncertain even to himself. How can these two common claims about God be reconciled? (There are definitely different ways to interpret "omniscience" and "omnipotence", and not all of them are going to be biblically relevant or logically reasonable. I imagine that these claims represent formalized, philosophical representations of God which might not have an _exact_ biblical basis (like I suspect the Trinity does) -- not meaning they are biblically _incorrect_ but just not necessarily _exactly_ correct in the way a human might understand them. Still, I think this is a relevant question.)