I've searched and researched and I can't find any comparisons of TEIN coilovers.

What's the difference between the RA and REs? Any reason not to get them?

The specs:

http://www.tein.com/ti/h48.html

 

Only difference between RAs and REs is that REs has a height adjustment at the bottom besides the spring perches. This will allow height adjustment without affecting preload. I swear I'v read this on Tein's website.