Try downloading Zedge from the market. It's a legit app that has tons of free ringtones, notification tones, and wallpapers. You can search, preview, download, and set the tones and wallpapers all from within the app.
I have a set of ringtones that I use with every phone, so I never even pay attention to the stock ones. Until I saw this thread, I didn't realize there weren't any regular types of rings.