What would be a good light for a custom 5.5 gallon pico for all corals
Something reasonably priced
What's reasonable to you. Lighting will be your biggest expense most likely, and the par bulbs I already referred you too are on the cheap end as far as reef lighting is concerned
Edit: reefkoi's par38 is $80 I believe and has a nice 20k look
A panel like the Taos will be overkill on that small of a tank, and tough to find for $100. IMHO a par38 would give you exactly what your looking for, and will grow anything you want in a 5.