cusco is jap isnt it?

bc is taiwan, sorry for generalising, but generally jap stuff is a bit better

but both jap and taiwan stuff are shit anyway

get a good set of euro shocks and springs, like koni and eibach, or US bilstein/eibach

avoid anything that has damper adjustability(though koni yellows seem ok....)

height adjustability......is fine i guess as long as u make sure damper stiffness is not affected by change in height

performance wise, u wont notice a difference really between having the spring separate to the shock or the shock over the spring....esp for street driving