The best bang for the buck is likely the cheapest one. I haven't owned an AT3600, but I'm currently using their very similar CN5625AL (purchased locally for $32) and it's working great on my LP12/Ittok combination. From your list, I've also enjoyed the M97xE, Grado Green, and Grado Blue. Having enjoyed other Grado models, though just up to the Statement Platinum1, I believe the Green is the best bang for the buck in their line.
Dekay makes a good point about getting the right match for your arm. Grados worked a lot better in the damped arm of my Well Tempered than in the Ittok on my Linn. I don't know much about the Q damping of your JVC, but it might work a treat with a Grado cartridge. If it were me, I'd take a chance on the Grado Green. Nice thing about buying from a local dealer is that if he mounts it up and it's not a good combination, you'll likely just be able to try something else and not get charged for the one that didn't work well.
Dekay makes a good point about getting the right match for your arm. Grados worked a lot better in the damped arm of my Well Tempered than in the Ittok on my Linn. I don't know much about the Q damping of your JVC, but it might work a treat with a Grado cartridge. If it were me, I'd take a chance on the Grado Green. Nice thing about buying from a local dealer is that if he mounts it up and it's not a good combination, you'll likely just be able to try something else and not get charged for the one that didn't work well.