I don't believe in equality, so there goes the first two options.
If I'm playing social engineer, I'd want a system that emphasizes (economic) mobility and incentivizes hard-work, creativity, and intelligence. If wealth is relative, then I'd argue for a system that maximizes the most opportunity for any person to increase their wealth relative to others.
I'm also a bit curious as to the way you've phrased the issue. The notion that wealth is relative seems to be a natural concept (I don't see it being much different than saying "the world is unfair," or that power/hierarchy/etc... will always exist). I find it odd that we need to engineer a system to deal with what I see to be a natural occurrence. Not saying that it's bad, just seems odd to me.