Doh, I wrote a bunch of stuff and closed the tab.
As I was saying earlier, the last video I rendered was 5:27 long at was 200MB. It was 1280x720, 30fps and the total bitrate was 9491kbps (90% quality wmv)
Instead of describing how it looks, I'll show you one of my older videos. there's a balance of dark scenes and light scenes, plus a lot of fast-moving objects. The source video is 8:38 long and 407MB (1280x720, 30fps) but was only 8517kbps, maybe I chose 80/85% quality, I don't remember. Anyway, be sure to click HD 720p and expand/pop-out the vid.
http://www.youtube.com/watch?v=RevGOjyxRLQThe original video on my PC is marginally clearer than the youtube version. Hope this helps!