I had the JB4 STG 2 and it's different car with that tune the JB4 is really the best bang for the buck. I had to return mine because I didnt like the installation. As soon as COBB comes out with the tune to work with JB4 I will be buying it. I have eye'd the DINIAN tune but 2k is pricey.... though you they supposedly will warrant any damage but I would be cautious about that as i have sene similar threads about people running into big issues when it happens.
Let us know what you decide with.