Why avoid color ones? I have Clara Colour, works great with Koreader firmware…

This is how I manage it:

• Usually I add feeds of blogs I find out from other aggregators (people posting links, HackerNews, Lobsters, Kotke.org, etc).
• This website categorizes blogs, I found some really good gems there, so I follow their feed.
• My RSS reader of choice (Inoreader) can show trending topics from feeds I am not following.