Hay Myka what you are saying make s sense but not everyone ca afford the expensive stuff. I would drill it now though if the tank is empty and if you feel like you don't want a sump you can cap the bulk heads for now until you find out how much movement there is in the floor. some times older houses will have twisted floor joist and will not hold as much weight.
I get Jenn's thought on the situation and don't blame her in some ways. I have a small bow front up stairs because the only places that I can put a tank right now is where the joists run parallel to the area, so no large tanks up stairs. besides in the basement I don't have to worry about the tank flooding as much there are drains in basements any ways but there would be almost no damage to the house.
I am bias toward Aqau Medic as their skimmers have treated me very good I have found allot of people that don't like them, you know that is them this is me. By the way I also like Deltec, ETSS and Red Sea Berlin skimmers because they are good skimmers ASM make another good skimmer that does not have to cost you your first born to get and does a good job, I can go on. I think the point is I think most people make good and valid points on here in most instances.
Myka I really like some of the reef keeping articles you have posted on here and have refereed some people to them, so your hard work and opinions do not fall on deaf ears but some time they can be heard of hearing.
I think in the long run we can all agree that any one in getting in to the hobby should buy the best equipment they can afford.

Bill