Hi Kegs
It's funny how people think darker clours make the interior hotter. RACQ did a test on that theory several years ago and found that the exterior colour doesn't affect the interior's temperature.
I've owned cars in just about every colour and you're absolutely right black is a pain in the butt to keep clean.
Another colour that might look good is a deep red. I haven't seen too many older cars in that sort of colour.
I know white isn't that interesting but if there is any panel damage it will be easier to match and maintain. There is nothing worse
than seeing a dark coloured car out in the sunlight with swirl marks all over it.
Regards Matty