Choosing an RSS Aggregator

While choosing an RSS Aggregator, I am stuck into the triangle of Syndirella, SharpReader and RSSBandit. I prefered Synderilla at first because of the "Press space to move to next unread feed" feature. Then I felt ignored by missing the threaded post functionality and therefore move to RSSBandit. It comes with the better of all UI for aggregators, but there are cetain things which I didnt like. First of all is the amount of memory that it consumed and second to that is the speed with which it works. After pressing "Space", I had to wait for a couple of seconds before it renders the feed. In addition, I personally find it very annoying to face a pop-up message box whenever a feed invalidates. In contrast, sharpreader does perform well. Only the "Press space" functionality because of which I moved to synderalla is missing. I still like Syndirella to grow, but there are some individual efforts to extend it instead of making a collaborative effort.

A couple of other options that I would like to see in Aggregators are:

-The ability to subscribe to any feed from the Internet Explorer's Context menu. This will be  ultraefficient method of subscribing to any feed.
-When importing an OPML file, I would like to select or deselect any of the feed. This feature is displayed in the upcoming FeedDemon.