I concider myself somewhat of a Liberty expert and the first advise I can give you is stay as far away from RRO as possible. Second, stay as far away from RRO as possible.
The place for offroad Liberty parts is Rock Lizard Fabrications
http://www.rocklizardfabrications.com/
They are located out of Colorado Springs and Marty and Troy are really great guys.
They sell several lifts which are a huge improvement over the lift that RRO sells. My Liberty came with a RRO lift and my front spring and struts were shot after 15k miles, luckily the dealer replaced them under warranty. I switched to a Frankenlift and it was a huge difference in ride quality.
Also I would suggest looking into getting a Diesel if you are considering getting a Liberty, they are well worth the extra money.
Lastly the main forum for KJ owners is
http://www.lostkjs.com/ I have been a member over there for 6 years.
Despite all there drawbacks, Liberty's are great little rigs and with just a small lift and some tires they are very capable rigs. In stock form they can tackle some very difficult trails.