What is a good RSS reader for Mac AND iPhone?

I want to invest in an iPhone, and I want my RSS feeds with me (which currently live in Safari). So, I want a Mac & iPhone application that keeps my feeds across systems, I don’t want an online reader ie: Google Reader. Preferably something free.

I know that Newsfire is a free RSS feed reader for Mac, but it doesn’t (as of yet) have a companion iPhone app.

Thanks.