I was actually gonna go with the Antec 300 but then I came across the 690. The only thing holding me back from the 300 is that their is no side panel window.
Out of those, I've only worked with the 690 and of all the cases I've worked with it was the best bang for buck case I've used.
Antect 300 is very good looking case as well but I've never played with it. Probably has the edge over the 690 with cooling and smaller but I like the look of the 690.
But like I said, I would get the Antec 300 but the only thing holding me back is that their are no side panel windows, and I don't feel like making my own