Compare for yourself and see if the differences are worth it to you.
X58 Pro vs
X58 Pro-E
Right off the bat, I can tell you that the E is preferred for OC'ing if that is important to you. The E appears to be a higher-end board. But check the specs and features. the E may be more than you'll ever use.
Btw, funny you should ask about the old X58 board. I just bought a used one myself. Still on its way.