Odd, but there appear to be two different people with the same questions about pricing of lights, same wattage, and same tank size too.
Anyway, DIY you can always (well, almost always) save a good chuck of change over buying the entire kit. If you were wondering if the kit is a good price, I would say yes. You might be able to find it a little cheaper, but prolly not too much cheaper than that. Assuming it's a PC set-up with bulbs, fan, switches, reflector, and enclosure.
For your tank, I don't believe MH is necessary, I think PC will deliver the light you need just fine. Of course, that's only my opinion.