Hyper 2/3, 2 Liter, CP - these guys all fit in my top 6. Of course, I also liked the vertical Maxflo I had on my Shocker - it worked perfectly which fit along with all the reviews that said you either got a crappy one or a perfect one - nothing in between!
I'm sure there are more, but these are the ones I like at the moment.
Never argue with an idiot; they'll drag you down to their level and beat you with experience." ~ Anonymous