nos or nx
Other than that I think you will find noticeable quality difference. But for your personal vehicle, I would need a some more information.
Possible FI?
What motor are you running? Stock bottom end?
What intake manifold? Possible upgrade in the future?
You can also call or Pm me. My name is Graham.

If you go with NX i suggest to go with their MAF kit, very good kit.
You should never spray under 3000 on a fairly stock motor. That being said many people do, including my self on a motor with 240,000+ miles. I spray around 2700-2800 and many people spray well bellow that. I am not telling you that you should spray lower and you may have problems doing so but many people spray bellow the 3000 mark.
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