Can anyone recommend an app for creating flowcharts and diagrams?

I'm seeking a Mac app for creating basic flowcharts and similar diagrams. Google has been no help; I've followed dozens of links to apps that either don't exist anymore, I can't find any real reviews of, or that won't run on OS X 10.6.6. What I'd really like: * A simple and clean interface * Basic shapes * Automated connectors that stay linked as you move shapes around * Inexpensive, preferably under $30 but definitely under $50 What I'm not looking for: * Hundreds of shapes * Default styles that have shadows and textures and such that I have to keep removing * Dozens of amazing features that allow you to automatically map databases and draw UML diagrams from code and such (I'm looking at you, Visio) that I have to constantly navigate around to make a few basic diagrams * A mind-mapping app with all the features such a thing entails, one that happens to also let you make basic diagrams * A full-fledged drawing app where, once again, I have to maneuver around a whole bunch of features and options to get to the basic functions I need. (I have Illustrator, I love Illustrator, but it's crap for basic flowcharts and other simple diagrams.) I wouldn't actually use it for flowcharts, but rather basic similar diagrams to show data flow between apps, information flow in a company or other places, that kind of thing. I recently found out that the drawing portion of Google Docs actually does a pretty good job with the types of diagrams I need to create, but the UI is pretty poor and it obviously requires a constant net connection.