I think the argument in favour of Amos is that he can play as a backrower as well - which means we could muscle up on forwards and still be able to cover an injury to Watts or in the halves.
To be fair, Payne had a pretty good end to his season, I think he really lifted when he had the captaincy.
Agree that Ash Graham should never, ever play fullback ever again (even though I rate him very highly in the centres). For interest's sake I'd like to see how John Williams coped at fullback - he's been one of the standouts this season, he's quick, got good ball skills, makes very few errors and has a bit of pace on him. Unfortunately, his goalkicking is terrible.
Finally - on the topic of Watts I was hugely impressed with him at hooker. He's got that gamebreaking spark that Thurston and Bowen have. I also think, with a bit more practice, he would be an excellent halfback. He has the vision and the skills, but if you watch any of the games during the origin period when he was at 7, you get the impression he doesn't call the plays very clearly. I think it's a confidence thing more than anything.
He is a very exciting player to watch - he's my bolter for origin in 3 or so year's time, as both a hooker and a halfback.