yep, this is the way to go. And also, CL has some good deals on tanks. Although there are a bunch of 55s, and that's not the greatest size for a planted. 4 ft lighting will cost more, too. What gallonage are you thinking?
I got my Catalina T5 fixture from one of the forums, and also my CO2 stuff, at awesome prices. So keep your eye peeled, both here and APC (Aquatic Plant Central). Some good stuff comes up, you have to be there to snatch it first.