Well what are your long term goals? ZEX is by far the easiest kit to install. But the dry kits like ZEX & NOS(their dry version) are really only good to about 75 shot.
If you want power & flexibility go with the NOS Direct Port kit. 80-200 shot adjustable. A CTR engine can handle the 80 shot minimum. The nice part about direct port is that it injects into the intake manifold rather than the intake pipe.
http://www.hondastyle.com/forums/sho...=&threadid=163