radflos are much better to get than the leveling kit...i just did this myself, was gonna get the spacers, but got the radflos instead....
i've had no problems with the coilbuckets....these co's have given me a much better ride than with stock...
i also have the 2wd and actually had greg at prg install the co's for me, he told me that on the 2wd the max lift is actually closer to 4", he cranked mine up to around 3.5" and i've had no problems at all with them...i love the way the ride on and off road, have taken them across some washboard dirt roads at roughly 55 mph and they've treated me and the truck awesomely....and yes you can get the prg uca's later on, i was thinking of doing this mod as well when i got the co's, but it was a little more than i wanted to spend
if you can afford to get these in the front instead of the leveling kit, i'd say go for it, you definitely won't regret it, i know i didn't.....:gunz: