First: The drive quality/driveability, or lack thereof, of the RR stuff has nothing to do with the quality of the parts. It's 100% in the design and if you understand how the linkage is connecting and what's happening when the drag link pulls on the tie rod then it'll all make sense. The JCR setup will have the exact same problem due to the exact same design. Again, it doesn't matter if the links are high $$ heat treated chromolly and the TRE's are excellent. The slop will remain due to the design. So, don't waste your money on either one--one is poor quality and poor execution, the other is higher quality with poor execution.
Second: A steering stabilizer plays exactly a 0% roll in the dead spot in this discussion. Again, that's completely due to how the tie rod and drag link connect.
Lastly: There is no correlation between durability and driveability. Stock steering linkage provides fantastic drive quality but has poor durability. The above two setups provide poor drive quality but have decent durability. If you want to increase durability without having any effect on drive quality, throw a ZJ tie rod setup on. If you want to drastically increase durability, go Currie.
It's that simple.
And if during your research you didn't come across this thread, here you go: http://www.pirate4x4.com/forum/jeep-...k-krawler.html
A lot of bickering but decent tech. There are plenty of other threads out there that discuss this exact same topic.