You may be able to find a good deal on a 4ft MH set up. My LFS often has them used. I had one, it had two 175 watt MHs and two 4ft actinics. I kept all sorts of nice stuff in there with no problem btw it was a 90 gallon.
Here are a couple links, one is a picture of the aquarium and the other is a 15 second video.
Doug
http://s172.photobucket.com/albums/w...arium15sec.flv
http://i172.photobucket.com/albums/w...guy/Image4.jpg