Thanks for compliments on selections! The slab is calacatta brasilioro from Brazil. The finish is leather I'm definitely getting that fixture in brass, just not sure on size. The fixture in our last house was 24" round. So I think the 30x15 will be fine?? I just keep thinking that the extra 200 is a faucet for the hall bath etc. I'm trying to reign things in a bit. New floors for the house really busted the budget. So I'm penny pinching now. I'm waiting on the formal dining fixture because is rather not have anything in there than have something I don't love. Anyway, I took some pics of the kitchen in its current state to give you a better idea of the room I could cry when I see the jungle growing outside the window. I don't know how I'm going to find the energy to get the landscaping under control until we can relandscape in the Spring. Husband making me wait until then. : /

Generally, lights are hung 30-32" above counter level. I would think that 48" would be plenty long enough for a billiard fixture, as long as you have lighting around the island that could fill in on the ends if necessary. Do you have cans near the island? The best idea might be to put two separate, smaller fixtures or pendants instead so you don't have such a massive, single fixture.

A ceiling fixture, or wall-mounted above the mirror?

The suggestions so far have been great, so thanks! I know that it's wise to focus on more than the cosmetics of the fixture. In my case, though, the front door light would primarily be an adornment because that door receives very little use, even from visitors. And because our neighborhood street lights are brighter than the sun, visibility after dark is good. I don't mean to minimize the importance of good lighting, but that isn't the motivation here. Finding a new above-door fixture was my goal, but am also considering no light at all.