ksport air suspension is actually not bad..... its affordable and actually has descent quality..i personally know few people who are rocking them

i would definatly STAY AWAY from ksport coilovers though... heard some horrid stories about them... generally leaking issues
i currently have neotech VE base coilovers.. its affordable and does its job.. the LE model has dampening adjustment as well but i figured i didnt want to pay extra $500-$600 for this feature, my intentions for footwork was strictly for looks anyways(slammage).
In korea tein,tanabe,bilstein etc. lots of famous companies offer coilovers and springs due to high demand but here... no luck
so you are extremly limited in option. i personally recommend SMA or Neotechs
I am currently a active member on one of the actual korean nf sonata forums and people have generally high expectations and positive feedback on Neotech and SMA products, and thats also the reason why i went with the Neotechs
Heres the catch though... our sonatas are not made to go lowww slammage.. if you decide to go low, the front upper control arm will hit the inner wheel well housing (the top part) on dips/bumps etc and make a painful noise while you are driving.. my height is the lowest it goes without having to worry about this issue too much.. (about 2.5 drop front) although alot of times when i drive over roads with bad dips or something it still makes the hitting noise..
so if your area has crappy roads, than....