The best multi-platform note taker for iOS/Mac

I want to know what the best (in terms of simple, astheically pleasing and that just works) note taking software is. Something to connect my typed Mac notes to my notes I take on the bus on my iPad to my iPhone's notes at 3AM when I have that amazing idea. Also, to paste in photo's, even annotate if possible. In practicality this is notes during classes.

It seems that there's almost too many apps to do this, whether they tout something over something else but they still have a crappy feature. I'm open to all suggestions, whether they be $50 or for free. So, what have you got.