I was running 4-55w PC over my 77gal tank; it was working pretty good, but I wanted clams and SPS so I made the transition to MH.
It opened up so many options for me and things came alive and grew.
Maybe my new skimmer and new calcium reactor has something to do with the growth.
I bought a used 2-250w radium MH set up, 2 new optimal reflectors, built my own canopy and incorporated the PC's.
You could either wait for someone to sell his/her old MH set up or get something from your LFS for about $600
How did I come up with $600?
Dual PFO $229
PFO mogul sockets with optimal reflectors 2x$69
MH lights 2x$100; then you have to feed the gov't and wam...$600.
If you are a handy man, you might be able to get away with being $450 poorer.
Another option would be to wait and see what SunAquatics might come up with their new line of electronic MH set up.
Yes, it's a money pit, but I love my addiction...