Have I not answered this question for you already?
As you stated (and I probably told you) the RCX kit does not come with new rear coils but only spacers. Which is kind of hokey. The Zone kit does come with new rear coils. Zone is made by BDS so in no way is it a crap kit. Neither is the RCX. Both companies make great products for the average user. Especially for the price. If you want to spend a lot more money for very minimal gain in quality then BDS or Procomp is your next step. From there you would be stepping up to full offroad kits and spending ridiculous amounts if money.