I don't own either setups, but I'll give this a shot.
KYB AGX/Whiteline
+ AND - If one of your AGX's blows out, you can easily buy a replacement for it and get it to your house in a reasonable amount of time. I don't think you can get an AGX rebuilt. Maybe considering the price of a new one it wouldn't be practical anyway.
- Damper not matched to spring rate.
- Ride height not adjustable.
- Shipping from Canada (PDM) might shock you. Best check that out first.
Tein Basic
+ Damper matched to spring rate (if Tein's doing their job).
+ Sounds like the corrosion problems with the threads on the HA have been corrected on the Basic. You should still keep the threads nice and clean.
+ Replaced everything between the strut mount and the knuckle. You can always replace your stock mounts with Tein Pillowball Mounts too, but you could use them with AGX's as well. The Tein Basic comes with some dust boots, which is nice. As I recall, KYB boots are ~$10 a piece.
+ AND - You can get them rebuilt, but you'll need to send them to Tein. What will your car be doing while the damper is away at the Suspension Hospital?
? Stiffer spring rate than the Whiteline springs. The spring rate is 6 kgf/mm for both front and rear (S13 and S14). Not sure how you feel about that, and since I haven't tried either setup, I can't comment on ride quality.
One last question...are you sure that the Ebay seller is reputable? Have you checked to see if any established online merchants (Phase2, etc.) can get somewhere near that price?
That's all I've got. Anyone else with first hand exp. can feel free to tell me I'm full of ****.
