as Cstemming said you're looking at $160 for sure cycle or $10 for a wolf. I have a wolf in mine and love it. I would insist on a wolf unless you don't mind sticking the 160 into it the gunsmith is trying to sell you on. If he hasn't heard of wolf springs, I'd question his credentials. Pretty popular amongst shooters with no g'smithing background. Should be standard protocol for anyone with formal training.
I've shot next to guys with SX3's..... I'd have no problem taking one for a test drive, they seem like a solid gun.