I just recently bought a 2004 GC Limited with Quadra Drive and 4.7 H.O. and I love it so far! I am more than impressed with it's off road capability it stock form.
I've had it off road a few times now, and just went up to Evan's Creek 520 last weekend. I was able to make it all the way to the rock slide, but had to turn around as there was a roll over. I'm planning on installing an IRO 4" long arm this weekend if all the parts arrive this week.