flapper,
What are you doing over here. You're not going to replace your Abit, after all that work you did to it are you? I remember reading a thread where one of the guys, Clevor, I think (it might have been someone else, though) was talking up the Asus. And here you are. Actually, I'm here for almost the same reason, but it's for my young nephew who needed a board, and remembering that "talk-up" I just referenced, I recommended that he go Asus. His P4P800-E Deluxe just got shipped to my office today, so here I am trying to do a little bit of leg work for him. He is young and needs direction. What is an uncle to do? Based on what I have read about these board, the two versions you are asking about are very similar in their OC'ing, but with just enough enhancements to the newer board to make it the better choice. Mind you, this information comes strictly from reviews and the likes, no first hand.
See ya later, back at the RAM Farm.