Are you taking about height adjustable coilovers? Stick with big names such as Bilstein, Tein, Koni, Sachs, Eibach, Apex, H&R, KW, etc. and you should be alright. Most ebay "non-brands" have proven to be pure junk. Many of the name brands are available as well but, as always, make sure you are buying from a reputable dealer/seller.
I have H&R's on my '06 ZX3, I like them but they are quite stiff. I also have Tein's on my '03 SE-R, also very nice, but not quite as responsive. It might just be the larger car though. On my '84 GTi I have FK's. They are fantastic for the track but hell on the street. They are extremly harsh in daily driving. Again, it might be the car, it only weighs 1600 pounds.
^^^ I believe that's frush's ride when he had the cup kit.
I've actually been thinking about the Eibach coil overs lately. I haven't heard of anybody on here that has them and I wonder if they would be a good compromise between performance and comfort (btw what eibach springs are included?)