It took us ages. I'd suggest you don't worry too much about it. Give yourself time and get your friends and family thinking about it. Eventually someone will come up with something that doesn't suck. Use placeholder graphics in the meantime and don't waste time on it until you really need to make the decision.

Try looking at keyword search patterns on Google AdSense. You'll get more passive traffic if your URL matches a search term. It can be a good way to identify keywords.