If you're looking for a 6-bulb T5HO, then the 6 bulb, 36" Tek should do fine:
6-Bulb Tek
That should put you about $400 once you buy bulbs. Individual reflectors and cooling are standard on the Tek, so it's going to be one of the best ones you can buy!
Although, unless you're planning to get into SPS, a 6-bulb might be a little excessive. As for LEDs, I don't think (even a DIY project) would be feasable for a $400 pricetag. I was thinking of doing a DIY LED for my nano and was priced about that for a 15G.