if you're mostly freeride then i wouldn't recommend the circuit. One of the best parts of what NS does is the rubber dampening layer they put in their sticks. The Circuit, along with the evo and the revolver, have much less dampening in them which chops up the ride a bit in rough conditions. With the circuit being the softest of the three (at least by reputaion) it lends itself to chatter quite a bit in choppy conditions. You can definitely do well with the evo because you are so light, but if the SL suits your riding style best then you should pony up the extra 80 bucks or so for what truly suits you.
I say pop for the SL