Thank you guys for all of the replies. I think I am also leaning towards keeping it web based. If I do that, I can still create an app for both Android and iPhone that basically points back to the website. So essentially, the "app" would be a shortcut, for the most part.

I had also thought about making this available to the public (selling it). Without giving away too much information, there is most definitely a market for what I am trying to accomplish. It may not be huge, but it's there.