Hey Chris,
I would either go with a PC fixture, a single or maybe multiple 32w bulbs, or perhaps consider an LED fixture which as I mentioned, I'm a bit out of the loop on with regard to progress in those fixtures.
You should be able to get a small PC fixture with 32w PC/Actinic bulb for well under $200.
On a tank this size, a single combination PC bulb mentioned above will work just fine . I had such a setup on my 7 gallon at it worked great, in fact at that time I was using a 24w fixture. The tank came with a standard light fixture, so I purchased a PC conversion kit from my LFS.
On a tank that size, the light is close enough to the water that 32, or even 24 watts is plenty for any low light coral that you care to keep.