That's a tough one.
The people at NewGator used to provide just about everything you want [webmasterworld.com]. However, they couldn't keep up with Google's free model of doing business, and they now use Google for the back-end of a number of their services.
Unfortunately for you, in my experience, Google's Reader is probably the best online RSS aggregator interface available. That will work very well with both your browser and iPhone.
I'd be interested to hear whether anyone could suggest a good alternative.