Sweet! You're going to love the ride!
I'm looking into getting those same rear shocks. I need to have my Radflo 2.5s rebuilt in the front. They've got 40K or so on them now, with several trips that had miles and miles of hard (and high-speed) washboard. My wife was just commenting that my rig doesn't ride smooth anymore like it used to. I'm sure I've worn out my rear Bil 5125s at this point as well, hence why I'm looking at the Rads now. You'll have to let me know how they do. I think that's the size I'd need also, or maybe I'd need the 0"-3" lift version. I'm probably right on the cusp.