I would also bring them out from the wall. It sounds like, with an 8' ceiling, you would be fine with just 4 lights (most recessed lights that I've installed have a fairly wide reaching beam). If they are all on the same circuit, I would think that 6 might be a bit bright for a room that size. If you have no other sources of lights (lamps etc.) then it would probably be fine. Good luck with your project!
Adam works with Airco
Service, Oklahoma's HVAC and Electrical partners, and enjoys writing about home improvement and technology advancements.