In the same boat. Can't decide between Blackwater Evolution 28s or the Pitbull 27.5". Probably going with the Blackwaters if they actually measure 28", and they are USA made.
The 28's do rub a bit on the 700 even with a 2" lift I had to go to a 3" to stop the rubbing except when compressed and turning.
Love the Evos they measure 28.25 for a 28" tire(10" wide tire on 8" wide rim and 4psi)
Tough 8ply, smooth riding tread and radial.
Grippy tire on rocks and mud.
Putting a set on my 1000 when it gets here.