I'm probably a special case, but I'm only looking at ergonomics and the number of programmable buttons. I want two buttons on the left side of the mouse (mapped

I'm probably a special case, but I'm only looking at ergonomics and the number of programmable buttons. I want two buttons on the left side of the mouse (mapped to back/forward) and two buttons to the right (mapped to Page Up/Dn). If you haven't tried web browsing like this you don't know what your're missing out on :). That leads me towards high DPI gaming mice, but I'm not a gamer.