Well, if you want really fast, a ZipZap isn't your best bet. You should look into a Digi-Q R, it will beat any tri-celled+ ZipZap. It's also a bit smaller and has better range. I have a Digi-Q setup for sale right now. You can read more about it at this URL:
http://tinyrc.com/forums/showthread....threadid=12282
email:
dcc@japan.com
-DC