in order to have good coilovers you gotta spend monies.. whats the price range?
Cheap: Raceland coilover 400 bucks (i wouldn't trust them in my opinion ya get what you paid for.)
http://www.racelandus.com/coilovers/mazda-coilover-kits/mazda-3-coilover-kit.html
Medium Cheap: Megan coilovers...