Most interesting take on this very much over-talked about topic (at least it is in my circles ;P) ... I agree that out of all belief systems, a simulation belief is probably one of the best for society... I used to think Buddhism took that spot but now I sorta think it is a bit too isolating and idealistic to be very good for large-scale societies.

Still, to me, the best way is the intellectually self-honest way: secular, atheistic humanism. Basically, admitting that we don't know if anything happens after the point of death, and probably is impossible to know (because its impossible to test). And thus, because of Burden of Proof, it's best not to take any beliefs seriously beyond how they make people behave (as we're doing now).

All this taken into consideration, I feel the best "belief" system is in fact pure lack of belief. Act as though this is it. Your only life. When you die, you no longer exist. Most people will then surely live their life to the fullest, once having dealt with that concept. (It's very hard to wrap one's mind around non-existence... nonconsciousness.)