[jspecusa]

Tanabe makes good coilovers, but you should contact them about warranty and service info.
My personal favorites are Quantum,Aragosta, Ohlin, and Kg/mm, but it's mostly jdm market so $$$$$.
Most coilovers are not comfortable especially the "good" stuff.
For my daily s14 I use Megan, because they offer 1 year warranty, they are local, and they sell replacement shocks after the warranty expires.
What comes down to it is to go to many track events/car meet and try out different cars with different setup.
What's good to other might not be good to you or good enough for you.
Good luck,

Sam