I've trialed various other services and FeedHQ.org is my favorite. (See my recent comment history for more detail on other services I've tried.) It's fast in both UI and checking feeds, and I like the multi-page design instead of the more common 2 or 3-column Reader-like layouts. Most importantly, this means than when reading an article I don't lose more vertical screen real estate to navigation bars.
Accounts are $12/year, so the service should stick around, but the code's on Github in case it doesn't.