hmmmm hard to tell without actually playing around with it. But I went to school for advertising design, and honestly my always "go to" for things like a blog.. would be to stick to a even contrast. So if your background is blue I would make your main font a white or black (white is what you said you were doing) then for links I would use a opposing color such as red or black, in your case I would say black over the red. And for the timestamps I would use the red. Stay away from green with blue, it sends off the feelings of "Chaos" honestly :)