unless u are really set on being able to adjust your height then i would go with springs. many people have trouble with coilovers not staying at the height they adjusted them to at each tire. an example would be HP coilovers on my friend's civic. but if u really want coilovers i would go for Ground Control. but if u change your mind and want springs, all of my friends that have 4g Preludes use the Eibach Pro Kit. these by far give the best ride and are high quality. just remember, u get what u pay for with any lowering application
also, any lowering appication will eventually cause damage to the stock shocks. it is reccomended to go with aftermarket shocks like KYB or Tokico. Some people's stock shocks can go a year and still hold up. Eventually though, u should buy aftermarket shocks.
take care,
tim