"Bold and round" will mean a lot of different things to different people. If you ask enough people, someone will eventually suggest Comic Sans Have you tried imagining your perfect font, and then running it through Identifont's "Fonts By Appearance" wizard? It's often a good way to come up with a font that's in your head ... but that you can't quite put into words. http://www.identifont.com/identify.html
Try Google Web Fonts. They have an amazing collection. http://www.google.com/webfonts. They are very easy to use and modern.
All my favorite fonts are here google.com/webfonts Bold and round .elem{font:bold 12px cursive;} Code (markup):