I think the Stock JS is very under rated. The JS engineers and myself worked very hard to get the Stock JS Racing engine to have a nice usable power curve with the best possible runtime. Port design on the case and sleeve, timing profiles in the crank and sleeve, and the case volume were just a few things we played with to dial the JS engine in. If you are interested in a $200 price range engine please don't over look the Stock JS.
I'm trying to get the Stock JS engines down to the $200 price range but it's the extra time that I put into each engine that cost more. What a lot of people don't know is that I inspect every stock engine I sell, along with adjusting the head clearance and testing and setting the carburetors up. It's not really a "Box Stock" engine as the head clearance is set conservative from the factory, along with the Carburetors.

Stock engine:
Full engine inspection
Head Clearance set ( Number engraved on bottom of case by me represents the head clearance.)
Carburetors flow tested and adjusted.
Engines are then resealed in heat shrink, boxed up and then sealed with an EBMods box seal.