i kinda left out the kyb agx/gc option because it requires a tiny bit more effort, modification, and money to install. not that it is an overly hard thing to do, just that it requires a bit more time than the other two options. i was trying to create the most simple to install yet still competitive suspension upgrade for the street and for my own car. the biggest bang for the buck without any hassle involved i guess.
tein basic coilover
$669 + shipping on springs + any new upper mounts
$400 shocks + $400 springs + new front & rear motivational mounts
i think the kyb/gc suspension upgrade would be more in the class with the JIC and TEIN SS .
I have the Tein Basic on my car. As said they dont come wtih the pillowball mounts. I think i paid $80 extra for them. So far after about 8 months they are great. Got mine for $760 shipped in a group deal on NF. I didnt need the adjustability so thats why i didnt so the SS. The extra travel gained is also good. At nearly 2.5-3" lower i've bottomed only once, that was on a speedbump.
I'd never take a spring combo over a setup good name coilover.