Great to hear and even better that you are happy with the power as you hear many saying the 4.3 needs more..I have only drove a 4.3 on track and loved it......Looking forward to when I can finally get one now Dean.......
Do it asap and you will never regret it.
I think it is one of those things where you want the 'best' option but when you get it you find you didn't really need it at all.
What helped me a little is having a couple of cars that are still great characterful cars to drive that aren't intimately all about outright speed. The Alfa GT 3.2 and the 306 GTi-6 are perfect examples. Plenty fast enough to enjoy at their full and never do you wish they had more power. I've said before the Alfa would benefit from an extra 500rpm before the rev limiter lickdd in but it doesn't need more power.
The XJL SuperSport is realistically too fast and not necessarily better for it. I think 400bhp in your ultimate fast sports road car is perfect. Do I lust after an 800bhp Superfast? No....not really.
Would I be any better off or happier with a 4.7 V8 Vantage? No, I didn't think or believe so and don't find myself looking at ads for 4.7's wanting to 'upgrade'. I also prefer the older style dash and centre console to that later one so that helped me decide as.well.
I guess for me it is all about real world use and also when is enough enough for people. We often demand and want more than we actually need. The day when we stop demanding more than we actually need in reality will be a better day IMHO for many reasons.
We never seem to be happy with what we have actually got often always wanting more. Our poor planet is suffering in many ways due to this. I agree that we should demand more from efficiency and many improvements we can make in many ways to make our lives and planet better. What we shouldn't do is want, demand and obtain more when in reality we don't really need it.
Trouble is the govt and many car manufacturers need us to keep buying more new cars even though we dont really need them. I'm still a believer that we should make our stuff last longer and repair/reuse when we can. We recycle 90% of cardboard boxes produced but only reuse 10%. Crazy really.