can any1 tell me the differnce between kyb shocks on ebay and some local midas shocks? does it matter is i go gas or air shocks? what will happer to the ride height? what the most cost effective way to go with my wekend cruiser? i have a 2 drop spindles up front but i want the back to be up a little higher, but i want a tight none sagging rear. please let me know.