If you already have an Evo, definitely don't get an SL. They're just too similar to rationalize having both.
If you want to stick with NS, I'd look at the Heritage, Raptor, or Summit. The Heritage will be the most playful, the Raptor best for balls to the wall bombing, and the Summit for powder.
I personally have an Evo/Heritage/Capita Charlie Slasher/old rock board/old cambered NS Heritage quiver. I'm probably gonna sell the cambered Heritage this fall. I'd think about splitting it if it was a tad bigger.
I agree with Nivek on Capita build quality. It's not terrible, but it's definitely not great either. My CS is holding up quite well, but then again, it's a pure powder stick too and I generally only take it out on deep days so it's not like it takes a ton of hits.
"People say that marijuana smoking is going to get in the way of my career. I say to them that on the contrary, my fighting career is getting in the way of my marijuana smoking." -Nick Diaz