I am not a huge fan of K2, and Union is an option, but are Union a good match with NS??
A ton of people pair Unions with the Evo. I personally don't like their toe straps and ratchets. Although they said they changed them for the production model (I demoed pre-production).
I have 390 Bosses on mine. Love em.
Burton Cobrasharks are another option. Minimalistic design and solid through and through.