I don't know if I'd give up quite that much for Noel, since I'm more bearish than bullish on his offensive potential, but I'd definitely be willing to give up Smart and another asset or two in order to get Noel. The team really needs what Noel brings to the table on the defensive end.
I really like Smart, though, and would be sad to see him go, especially if the guy coming back is less than an All-Star prospect. Noel may be very valuable in this league, but he'll probably never be an All-Star.