I have an LB/W MCS myself and i'm really pleased with my choice, If you like blue cars I think you will like Lightning Blue. A couple of pics of it here -
http://www.mini2.com/galleries/showgallery.php?cat=2201
As far as the interior goes I personally like the punch leather (which is the black version of the Tuscan seat) but I understand why people like the Lounge leather as it does give the interior a very premium feel to it
Over here its quite an expensive extra on top of the normal leather seats hence why there aren't all that many pics.
Sir Johnaraz has an LB/W with Carbon Black interior (and just about every other option possible
) which should be almost exactly the same as you have specced -
http://www.mini2.com/galleries/showgallery.php/cat/2202
I can't really comment on how the dark interior will be in the heat because its bloody cold in the UK at the moment
The heated seats are good though