A 10 gallon tank is too small to setup a reef tank in. The 30 gallon would probably be okay but I think you would need about 275 watts of compact flo. for hard corals.
Reef tanks are hela-expensive and even if you go with compact fluorescent you have to change the bulbs out every 6 months.
If it were me and I wanted a tank that was easier to care for and cheaper I'd think about African Cichlids. I know on my 55 gallon tank by the time I was done I spend over 1500 on salt, rocks, skimmer, and lighting if that gives you any idea what a salt water reef tank is going to end up costing you.