Hmmm....well maybe gearing is more important than power, but I'd bet deep down inside Nathan would trade his V6 for a V8.
Hmmm...that's difficult to answer.
The V6 gearing is perfect, and noticeably better than the V8's gear ratios. I have driven about 8,000 miles in a V8, and 38,000 miles now on my V6. I have a pretty good feel for the differences.
I WOULD "upgrade" to the V8, but only if I was getting an HSE with all the bells and whistles, otherwise, my 05' V6 is going to stick with me for a while. It's the HSE creature comforts that would entice me to upgrade, not the engine.
Every time I drive a V8, I get back into my truck and do not find it lacking, which to be perfectly candid, is a relief, each and every time.
The V6 is a bit louder, because it is working harder. There is no appreciable difference in gas mileage, but I learned to drive from rally racers, so take that with a grain of salt
The biggest difference between the V6 and V8 LR3, is that the V8 makes the truck feel lighter and more nimble. Off road, there is no difference, the V6 is an incredibly torquey motor, and can run circles around older Land Rovers with the 4.0L V8 (and 3.8L V8's). Some mechanics I have spoken too feel the V6 is a more durable motor than the V8, but I have not ever heard of any V8 problems, so they both seem pretty good in that regard.
If you opt for the V6 to save money, you won't be disappointed, but if you have the opportunity to get the V8, I would suggest you do so. When I bought mine, it was a huge financial stretch, so the V6 was my only option. I wish for the creature comforts and air suspension of the higher spec models, but I don't pang for the V8.