First off, way to revive a 2 year old thread. I actually read through it and learned a lot of good stuff. Finding these old threads and reading through them is a great way to become more acquainted with the Liberty. However, I think it'd be a good idea for you to start a new thread.
I'll respond with the limited knowledge that I have learned over the years of owning a Liberty. You've definitely started right by summoning the great TomMudd.
I could be reading this wrong, but I'm guessing that the spacer lift is on the Jeep. If it is on it already, then go ahead and measure your fender height, I believe stock is between 18"-19"
19 INCHES from the hub, so if your suspension hasn't sagged much since replacement, then you should expect it to be around 20"-21". If it's less, then its time to consider replacing your struts, springs, and shocks.
TomMudd Econo Lift is a solid way get the lift back. For the question of the rear shocks, his kit uses Ironman shocks.
NO YOU CAN GET ANY REAR SHOCKS Bilsteins are also listed on the JBA site,
here. I know that's not necessarily important to you, but if your specific goal is offroading, then ground clearance is a big part of that. There's other ways to improve your offroad performance besides a lift, and in my opinion that is via a locker. It's not a cheap upgrade, but it'll drastically improve the offroad capabilities of the Jeep, which I'm sure you know.
Anywho, get a new thread started explaining what's currently on the jeep, and your goals, then you'll probably get some more replies other than mine.