I'm running a setup about the same as Drew's (softer shocks than most are running) except I have 5/7/2 in my diffs and 10.75r/9.75f (updated kit springs). I will try 3k in the rear next. Car is really good and I think it can still be better.
I liked 5-5-2 but the car didn't seem very positive on throttle, like the canter diff couldn't decide which way to send the power. I've always liked 7k in the center diff of every car I've owned though.