I think £7k is a good price point really, paying much more than that starts to induce diminishing returns, paying less is ok ...but I wouldn't go pre-facelift ...the first-face lift is the important one, the second one, is just cosmetic really and nice to have I suppose.
I think if I was going to have another one, I would go with the light grey leather seats and I would ideally want xenons. But at the end of the day, I wouldn't get too hung up on the extras, none of them really change the car. I suppose once you've had xenon lights you wouldn't want to go back ...but they are fairly rare on these so tricky to make an absolute. The nav just makes the dash look better really, it isn't all that good at all and is just a nice toy to have ...it's not important ...at least I don't think so.