For my 75g I plan to get two Workhorse7 ballasts off ----, $40/each, and then four 4' 110w VHO bulbs (2 50/50, 2 super actinic) off of prem aquatics.... or maybe 'rine depot. Get the endcaps, one pair for each bulb, make sure they are waterproof. German endcaps are the most used for waterproof I think? Then ya might need some kinda reflector to shoot stray light down into the tank, but I think most VHO bulbs come with an inside reflector so you don't need this???? Some people just use good white paint to achieve this.
Hope this helps.. I'm still learning about it all myself. And most of that stuff will be alot more at your LFS, like everything else usually. I hate to not give them my business, but I'm not rich and I can't spend 50% more there just to keep them in business. Jack yer prices down to normal and I'll buy from ya!
anywho.. l8r