Since I am on the left coast, I got to see WCS play more last season (mainly against the lakers and clippers) than I saw Noel. I was never really over impressed with him. He was ok, not as strong defensively as I thought he would be. I personally wouldn't give much to get him. If Sac is having a fire sale on him and it doesn't take much, then yeah he is an improvement over Mickey, but seems unlikely that he would take minutes over Al, KO, Amir.
I haven't seen as much of Noah, so I guess that is why I am more open to him than WCS. WCS will be cheaper, and maybe in the end that is all that matters for a couple of years.