I think your on the right track. You will need 3 MH bulbs for that tank. Deciding on the combination of the MH wattage will kind of depend on the type of coral he would like to keep. I would think you need 3 x 400 if the tank is for SPS and it is 30" deep. Softies and LPS could be kept under 3 x250 or 1 x 400 and 2 x 250.

You should consider T5 bulbs over the PCs. T5s produce more light compared to PC, based on power usage. Plus T5s have twice the life span of PCs. I would go with either 4 or 8 36" (39 watt) T5s over a 6 foot tank.

You should check out www.hellolights.com as well.

Single ended bulbs (aka Mogul) do not require a glass shield for UV but Double ended do.