Hey gwade, which Tahoe did you go with? I have been wondering the same thing, is the RST ride quality worse than the z71 (assuming z71 has the air suspension and both have magnetic ride control).
Still haven't gotten one. My wife likes to, you know, actually see and drive stuff before making a purchase, and frankly you can't find anything to see on lots (Expedition, Navigator, Tahoe, Yukon) around here. I suspect we'll have a new president before we decide on anything. I'm taking a fancy to the new Lexus LX600...but then again, I'll be glad to wait until they stop selling crap at MSRP plus anything.