To be Honest Colour is a personal choice, the rule of thumb is to use as dark a colours as possible and as close to back aswell. But having an all black room is not always the best looking even if it a dedicated room.
However the more important thing about the paint you use is the refelctive properties, you don't want any reflections from the wall this will kill contrast. Ask a crown sales person over the counter who should give you an idea whats best. usually to get the best finish you will need a undercoat and then 2-3 layers of the final paint so take that into consideration when you budget. The paint manufacture I can't help with, I used delux which is good, maybe someone who used Crown can tell if it's any good but can't see why it wouldn't be.
On my cinema room: -
Gibbs Home Cinema
you can have a combiniation of 3 colours, painting the ceiling black is very possible.
The modern colours at the moment seem to be dark brown to dark yellows. I've gone for traditional colours because that what Ilike. It's up to you.
You don't even have to use paint you can use other materials and even sound absorb sheet.
A good reference is to use the cinema room gallery for help. Also google image search is good, just type in home cinema or home theater.
Hope this helps.