I was thinking of something darker too, Banner size will depend on what the banner itself looks like. You're not going to see much more content because you have the featured videos at the top. If they were gone or moved to another part of the site, then you'd see more content. We'll see though, I'm open to anything.....
Joomla yes because that is what the site is run on. I'm not a Joomla guru and installing a normal layout will be beyond my skills, lol....It would probably take me forever to figure how the Joomla coding....
I've seen some joomla templates that I wouldn't mind trying out and edit them as necessary...I gotta make sure that everything fits and looks right. This one is so highly modded it's not funny...