Easily done
I was much the same when I first drove a 3.9 and I'm now on my second V8, though the fact that fuel prices are 3x what they were when I bought it does mean it will probably be the last. I suppose the bottom line is that I don't care if you probably can get a chipped and intercooled Td5 to go faster on paper, I know it won't put the same smile on my face when I press the £££ pedal with the windows down :)
Mine at 6.5 years old and 38000 miles is worth next to buggerall here now, so I see no point in selling it and spending an extra £20k (which I don't have) on a Discovery 3 (which will use nearly as much fuel and most likely break down every other week). Anybody looking at buying a used V8 model in the UK is getting a bargain if they find a good one!