That's a good link.
Here's another. Your best bet might be to 1) get glass canopies (simple, folding pieces of glass; pretty inexpensive) to fit the tank top, and then 2) position lighting on top of them. This is how a lot of us make our "hoods." It's not as elegant as a nice large oak canopy with a ballast kit that attaches the lights to the inside of it, but it's economical, and fairly easy to deal with.
Here are some Perfecto glass canopies: http://www.drsfostersmith.com/produc...al&Np=1&N=2004
Here are the all-glass "versa-tops" (same thing):
You'll want to get the ones that fit to the middle beam in your tank (2 30" wide All-Glass tops is prob. the best), and that don't extend all the way back to the back of the tank, so that the filter, heater, etc. has room.
So, the conclusion of this:
I def. recommend 2X the 30" All-Glass Canopies ($15X2=$30) and either a 48" light, or 2 30" lights (see first link from MHaynes).