It's good to have the data backed up. What if your new reader doesn't work out and you want to swap after Google Reader is gone? If your new reader doesn't have similar export functionality you are stuck.
This is fantastic, I like it. Though, I'd love the option to configure the stories selected in the left pane to open to comments first rather than the story. I usually browse HN in this way. It allows me to get peoples' opinion of the piece before hopping in and investing a bunch of time reading what might end up as blogspam, etc.
Zurb Foundation seems to be what you are looking for. It uses SASS and actually predates bootstrap and is being actively maintained. Its a great alternative. http://foundation.zurb.com