How much traffic do you expect to receive?
Even better question, how much capital are you putting into this venture?
We'll I'm not sure on what to expect, but my faucet will be the highest paying bitcoin faucet on the web. Just enter an address and boom, .0001 BTC every 24 hours.
If you can really make your faucet the highest paying that will drive some decent traffic. Maybe .0005 BTC a day would get you in the lead. I like to see the competition.