Dctarget -- I disagree it kind of awkwardly locks him into Hooper for a while, it'll be tough to justify dumping Hooper as captain if things are going well enough should you know who you want to lead your team at the next World Cup.
And Hooper has always fucked up every back row he's played in -- by not playing like a back rower.
Given you are basically locked into starting Hooper, I think the back row needs to be either Wright, Hooper and Wilson, or Valetini, Hooper and Samu. Wright is the better 6 and possibly the best back row lineout jumper (okay Ned is maybe better at that - but average at everything else), but Samu is likely the better 8.
Wright vs Samu and Wilson vs Valetini. Ultimately, I'd tend to start Wright & Wilson so you can use Samu on the bench as he fills all three back row spots, although Wright is capable of playing 6 & 7 too.
I don't think we can play LSL (Lukhan Salakaia-Loto) at 6 -- for the Beld series we aren't getting any internationals, so he's gotta play lock, but regardless we REALLY need to give him a position and have him play that position for a good 12 to 18 months so he can get his body right for playing that role. Maybe we play him at '6' as a part of a bench setup with another lock on the bench so he can come in to play 4/5/6.