I have gone with the 28mm Schwalbe Pro Ones.
If they are even half as good as they are supposed to be they should be amazing.
Malcolm of Cycle Clinic seems to think the whole tubeless thing is easy but I am pretty much going to be riding G&Y as my test ride.
One thing he did say when I said I was going to go tubeless on the new wheels was "you will be using Schwalbe won't you ?".
If Tippers and I end up at the side of the road together covered in sealant I will not be happy
Mind you, I won't be using them in Wales as I will have gears for that ride.