Word on the street is that 1968 is their house yeast. I've used it in clones of Zombie Dust and Pride and Joy with very good results. My clone of Gumballhead won't be ready for another week, so I can't comment on how 1968 works in that recipe yet.
I'd say any neutral ale yeast like 1056.. I've done 100+ gal of each.. using 1056 ...both have a hop forward taste... Amarillo for gumball and Citra for Zdust ...the yeast seems insignificant in the hop schedule for these clknes
1056 is a fantastic strain and while its Fuller's originally there are a ton of American micro's that use it. English beware, this yeast is ours now!
It has some great esters that go amazing with hoppy beers, esp citra and amarillo. Don't be afraid to ferment this yeast at the higher end of its temp range.