Most of the Jap EBC's are very good, and lots of them are overpriced with gimmicks that arent needed.

Ive used the Greddy Profec B Spec II to good effect on a few cars. Simple, easy to use.

Recently got some Gizzmo boost controllers, which are supposed to be good. Ive yet to use one yet though. They look like nice little units though, and are keenly priced.