Personally, i think you should buy all new equipment. That way you can send me all of your old setup, I'll even be so kind as to take it all off your hands at no charge to you whatsoever.
On an Honest note. My opinion is normally, the more you keep the same, the better off you are. But in your case, I would love to see a whole lot more live rock up the back and all the way across. Keep your open space across the front and use the live rock/corals as a nice natural backdrop.
Just My Opinion.
Steve