Isn't Comptech not around anymore?
smaller pulleys can always be custom made by machinist the big thing is that the smaller pulley u go the more heat soak ur gonna get...if u need any help with superchargers let me know i have hundreds of cars under my belt supercharged
maybe if u stay within its effeciency range (like rsx guys) but when u start pulleying down and really spinning it u run into huge problems...i have worked with hundreds of cobalts and ions that are supercharged (roots style) and have owned one myself...they heat soak bad..heat soak is not a huge issue with roots style chargers because you still run the normal bolt ons like cai. Heat soak is there, dont get me wrong, but its not as power robbing as heat soak from a turbo set up.
One of the things to keep in mind when goin with a s/c is if you are going to build the block or head build it just the like you would if you were staying n/a. compression can go around 11:1 on a good tune, n/a cams are better than turbo cams for s/c.
as far as who makes the better s/c, its just like everything else, personal preferance.