i just bought a aqualight PC fixture for about 200 bucks at my LFS... it has 2 96 watt PC bulbs included.. should be more than enough for a 30 gallon.. its 196 watts.. almost 5 watts per gallon.
1 is daylight, the other atinic.
but anyway, im really happy with it, and i should be able to keep many different corals with 5 WPG
MH stuff is really expensive.. maybe ill go that way when i upgrade to my 75 gallon.
regards,
jib