Wang for Santana?

Peter Gammons reported on his ESPN blog about a possible trade for Santana involving Wang. I don't know about this. Santana is an incredible pitcher but we`ll have to resign him again and Wang will be cheap for a few more years. They would also still have to give up another good prospect or two. On the other hand, Santana would give us that true ace who you can completely trust. It depends on how many other prospects it would take. Wang is a vgery good #2 while Santana is the best in baseball but is the improvement worth the cost?