I've been researching some suspension upgrades myself as well (im just sitting on H&R springs with new struts, rides nice, feels stock and almost 2 inches lower, small drop)
anyway
the Koni/GC setup has literally like no negative comments or bad rep. i havent seen one person complain. ive also seen a lot of Ksport Pros being run reliably without complaints. Typically, Koni/GC runners argue against Ksport runner, vice versa, but they both seem to be great setups. The deciding factor i would consider is Konis lifetime warranty, although many people have had issues going about replacing broken parts, it is there.
For the price, those are the two setups ive heard best about (again, never OWNED them, but Ive driven them)
check em out, and ksport has a TON of dealers locally throughout the states, maybe you can find a good price.
overall, over the counter, i would take the Koni/GC because of the warranty and the fact that you can personally resolve any issue. Of course, its a very reliable setup and they dont go out to ofen, but, if not, i would look into other options as well as still considering the Koni/GC setup.
Ive had experience with Skunk2 as well, hated it to. Springs are annoying because unless you can drop some decent money to get springs with spring rates designed for each corner of the car, your gonna lean towards the driver side regardless.
Some of the Tein full coilovers are good too, but very pricey.
full coilovers vs sleeves do have advantages as well, look it up and maybe thatll help your decision.
