You didn't post up which models from KSport or D2 you were considering, what's the price on those? Doesn't really matter, Ksport, D2, BC, Megan, Stance...unless you're only considering them for dropping your car your money is better spent elsewhere.
If you're after performance look towards the Bilstein PSS, KW or (if you've got the money) Moton. Realize that depending on how far you lower your car you're going to need to address some issues in the suspension geometry that will necessitate buying parts you might not have planned to buy.
Some helpful links (
Search is your friend):
Best Coilovers under $2K
Camber & Toe Issues
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