I vote wide also as long as you can reach to the back some way.
I went out and looked at the dimensions of the 180 wide and at 72x24x25 you should be able to get by with 250 watt bulbs still. Of course keep you most light demanding corals higher.
I have the 135 that is 72x18x24 and really like the footprint and the extra six inches from front to back would be nice, but a real pain for me to reach back that far since I'm only 5'7" tall myself and don't have access from the back.