I agree that 2x T5NO (or 4x if you buy shorter ones and put them side-to-side) fixtures would work well. Multiple fixtures would give you lots of ability to play with the photoperiod to find what works just right for you. www.BigAlsOnline.com
usually has the best deal on the Coralife T5NOs and do price matching if you happen to find them anywhere else cheaper.
Or if you're handy with DIY, you could make your own. If you go with T5NO bulbs you'll probably want about 3 rows. If you go with T8 bulbs you'll want 4 rows. You'll ideally want to space the rows bulbs out a few inches apart to get better light spread across the bottom of the tank.