T5 HO can work well, you just need to make sure you get enough bulbs in the fixture. To be honest, I don't know if a 6-bulb or a 4-bulb fixture would be best for your tank. I have a Tek fixture that I'm very happy with.
As for price, you basically have to bite the bullet and spend out on a really good fixture from the start. A Tek 36" with 6 bulbs will run around $350 (including bulbs).