Maybe I missed something with his contract, idk, isn't it approx $11M per yr for four years? If that's right, is he worth that? Must be if you say so. It's not my money paying him.
As a rule of thumb, I'd say whenever you get a solid rotation player at 10% of the cap or less it's a good deal.
Others around here would probably have a better sense than me, but I'm pretty confident that we would have no problem trading Nance for an expiring contract if we wanted to get him off the books for some reason.