I don't know about you guys but my XJ uses green coolant and WJ uses orange (not green for sure). I don't want any corrosion or leaky seals so I prefer getting my coolants from the stealer....I mean dealer.

I have the RE5.5 setup. The drop brackets got me hung up on rocks a few times.
As for upgrading to long arm, I prefer the TnT kit over the other two options. You should consider installing their frame stiffener at the same time.