Id have a toss up between Folkes and Murray.
Murray because hes turned a side around like nothing else, and still with basically the same side he has last year. Folkes because they are likely to take the Minor Premiership and the way he handled bad press after bad press.
Stuart has done magnificant but I guess you cant really consider him unless the Roosters win the MP, same with Wayne Bennet - mainly cause of the class sides they have.
Sheens is up there but doesnt deserve it by any means, the Tigers have been reasonable after buying alot of players last year, but no way could you give him coach of the year.