I don't trust Jefferson's health. He's played 8 full seasons and only been active in 70 or more games for 4 of them. We have enough of an injury problem where I wouldn't like to see him paid big bucks to be added to the gurney rotation.
We really need an offensively skilled big though. Milsap is much healthier but I'm not sure how much better he will get from where he is right now and how much it would cost to get him. I wouldn't be opposed to signing him though.