Sounds like maybe your shocks are blown, or something in your install went wrong.
The Mugen Suspension is a great choice - every review I've read of it is positive. Search on "mugen AND suspension" and you'll find a ton of threads about it.
There are a couple other good alternatives, like the Tein Basics, which are heigh adjustable. But you'll probably want to go with a full coilover combo (shocks and springs) regardless.
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