I just posted over on your other message. If i were in your position, i'd get the 55x1 and put your old 2x13 at the outer edges. Though, that is quite a bit of lighting. Just a bit over 4wpg. It really depends how much maintence you want to put into the tank. The more light the more work you're going to have to put into it by trimming and even with the initial battles with algae. I see that you also have a reef tank, so you're not new to maintence. =D
GL to ya.