I like the idea of combining the letters into a symbol, but the upside-down backward "e" just doesn't look enough like an "a". Also, the overall design is a little too simplistic. Please keep your ideas coming, the effort is appreciated.
I prefer #49 over #48 but #49 and #50 are both still a little to simplistic. We're looking for something that looks a little more professional with more of a "wow" factor.