I have (in late games for fun) reconstructing asteroid systems with all planets of my atmosphere (keep building / destroying 'till you get teh right one), then build monoliths on all of 'em. You can get a bunch of production out of one of those systems. Its kinda' a personal preference though; you gotta' figure the cost benefits of RW/SW's vs reconstruction. IMO, asteroid fields with small numbers should be candidates for RW/SW unless of course it has 3 stars. Then definitely RW/SW
