Renraven, definately the JZ, between the JS and JZ.
The JZ runs cooler than the JS, and if you step up to the RAID0 model you will get awesome IO throughput. Definitely the JZ.
And, if you want to never worry about what GPU is going to run my app peace of mind, between the JZ and the JH, get the JH without Optimus.
With the JH vs the JZ, you don't need to manually switch on the Full fan GPU option when gaming for hours like on the JZ (JS/JM too), the JH automatically controls the full fan range automatically.
IDK if you can find a JH in your area, but if you find a JH with the RAID0, it will be a cheaper model than the JZ with the RAID0 too, with the same performance and no worry's about Optimus compatibility for gaming.
Let us know what you end up getting 🙂