In my ever present drive to Kill the Thief class, I was looking at Spears of the Dawn. In that take on B/X, they got rid of the thief class entirely and folded it into the fighter. So you basically have spell caster classes, and the bad ass. So, with that in mind, I present the following. This class is ‘not balanced’ with the existing classes, and takes several liberties with the design system, but instead tries to make the ‘fighter’ more comparable to the mage.
This class also (unintentionally) gets rid of a lot of need for subclasses. Obviously, they can still exist (big benefit being cheaper xp progression).
http://micahblackburn.wordpress.com/2013/03/23/house-rules-classesadventurer/