Maybe I have a high tolerance for flogging the beast, but I am more than please with the power and torque of the V8. On a recent trip to LA on the I-5, it held 6th gear over all of the rolling hills just North of Harris Ranch. Of course, I was going 80-90mph, so was pretty high-up in the rev range. Even going over the Grapevine, I was able to maintain 75mph with a lot still in reserve.
I agree that the transmission is very well matched to the V6. On my loaners, they accomodate themselves very well. I remember seeing that the torque curve on the V6 was really close to the V8's below 3000rpms, maybe even better-can't specifically remember. They obvisouly tuned it for the LR3, giving-up some high-end hp for low-down torque.
That said, I really wish I had your Toureg's V10 in my LR3, jwest. It is a fabulous engine, almost ridiculous in a mid-size SUV. Enjoy!