You gotta keep Prior and Z. I object to trading them. Unless you want a 4 year reconstruction period, I wouldn't trade either. By keeping both of them you ensure a 1-2 ace punch, that is a good core with Aramis Ramirez, Michael Barrett, and Derrek Lee. Plus, this is totally pointless as his value is at an all-time low right now. Even if you were to trade him, at least wait until he gets a couple starts under his belt. But as I've said before, now is not the time for massive trades. Wait until the trading deadline when teams get real desperate. There will always be room for a Prior on a pitching staff. No need to hurry and sell low.