Can you please explain the Tahoe being "more vehicle than we need"?
The Tahoe is bigger, 6" in wheelbase, 5" wider, 9" longer, but the V8 fuel economy (2005 T4.7L:C5.3L) is a wash, 14/18:13/18, and the V6 isn't significantly better. I'm in the market for my first 4x4 and the Tahoe is really difficult to ignore. The minor fuel difference will be quick be eaten up by any replacement parts required. And I have known several people that have owned a GMT, and none have anything bad to say.
In my research and my opinion, the GX470 is so much more attractive than the 4G 4R: great visibility, comfort, barn-door, common components (as nalledge mentioned), and it's a Lexus (which is good given the differences in production). And given the fact that here (Seattle) the Toyota tax doesn't seem to apply to the GX, it's relatively the same price.
For me, I really like the idea of the Jeep WK 3.0L diesel. But just below that is a log jam of the GX, Tahoe, Commander, Liberty CRD, and 3G 4R. A lot depends on my wife as she will occasionally be driving my vehicle too (and she's not ready to go car shopping). There are a number of other possibilities, but that's my short list.