NetNewsWire
http://www.newsgator.com/individuals/netnewswire/default.aspx
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FREE
NetNewsWire is the best RSS reader for Mac OS X. It’s easy to use and was worth the money even when it was a paid product.
Migration Score
GOOD
Migration Options
NewsGator Online
Because NetNewsWire syncs with Newsgator servers, I can check feeds easily on my iPhone or online anywhere. It's great.