There is no single theme that will suit everyone. I don't have to be told that by every third poster. I also know from looking at the user account settings that three quarters of the board is using stealth or the PHB style, both of which are dark text on light. Go browse around major sites - ENWorld is the exception, not the rule. It is for this reason the main theme is being switched up.
Another change that cannot be derived from the screen shot is that I am pointing every single element of the design to a style sheet setting. vbulletin doesn't do this by default, so it means an extensive rewriting of the templates. The finished site can be reskinned by anyone who knows CSS without worrying about the javascript or the templates. If anyone wants to do that work before I can get to it I don't mind uploading and adding what they come up with.