my gf when i first started out trying to get away from cfls got a 600w batwing off ebay for 120. came with mh/hps bulbs and a switchable digitial ballast batwing reflector.
i have 4 1k aircooled hoods
but atm im running that 600 and shes still working beautifully almost 2 years later.
screw the ghetto floodlight setup and mag ballast
just shop on ebay a bit
check out my journal you can see the light