Generic Ebay Coilovers are shit.
They bounce, blow shocks, and are general crap.
The GC Sleeves have a set screw that tightens the adjuster on the sleeve body, making it nearly impossible for it to move. Comes out easily when you need to adjust it too (didn't use any anti-seize on mine, come out easily after two years of not touching it).
But, keep in mind that a suspension will 'settle' after you drive it a bit, lowering the car. That's why after you lower a car, you need to drive it around a bit to get it to where it will sit. And if you have stuff in the car, it will also effect ride height. And a good alignment after it's all settled in.
I'm running KYB AGX Shocks with off the shelf Ground Control Coilovers. It works great. It's a tad bumpy on some roads (which I think is more the roads fault) and it's stiffer than stock, but it still rides nicely. I pieced it together for less than $600 with brand new parts off ebay. You can probably do it for cheaper. Tokico Illuminas are good shocks as an alternative to the KYB AGX's. If you go that route, get which ever is cheaper. eBay is your best bet for finding this combo, cheaply.
The Koni/GC combo is more expensive (most people end up at like $800 for the combo) but most people agree it is well worth it. Weak Suace sells the combo for a good price.
Progress makes a quality set of solid-body coilovers for less than $600 too. They have good reviews (Bisi uses a set on his Wagon) as well.
Progress Technology: Anti-roll bars, sport springs, coil-overs, camber kits and more since 1995!
F&F and Tein probably makes a application for the DA too, but I haven't heard of many people running them. Probably more expensive than the above options too.