Theme that has some Width?

I’ve been looking to take a new Theme that has some width on the Article space, when you have the article only filling 25% of the websites width i find it kinda stupid and i think that it would be much easier to add larger images and do formatting more easier if i had a theme which is a wide one.

Please throw some recommendations, my current site is http://www.mobamonster.com and im using monaco theme, the actual site width is like 33% of the actual space and the reading area is even smaller :/