I've been wrestling with the same decision. Was close after getting destroyed by Hurl, then my team threw 10+ wins on the board against two good teams. Will probably tear it down after silvergun destroys me.
I like Estrada. I've thought since the trade that he should be in the rotation and hated that he was being used in low-leverage relief. I just don't think he's a guy you look extension with. There's a ton of better talent hitting the market this offseason.