What bulb combo is best?

[doch]

Kind of depends on your tank size and depth (mostly depth), but nothing that you listed here requires tons of light. Go as blue as you want. I like the KZ line... maybe 5-6 Super Blues, 4-5 New Gen, and 2 Fiji Purple. This will be a really blue look. If you go SPS down the road, lean more towards the 4-5 Super Blues, 5-6 New Gen, and 2 Fiji Purple.

I just remembered... you have clams, but they should be fine with the first combo.