Any 3 watt led fixture should be more than enough. That's what most fixtures use. There are a few out there now that use a mix of 3 and 5 watt leds like Reef Breeders. But they have features that you may not want to spend the money on like sunrise/sunset control and 6 channels of color control rather than just 2 (which is enough for all but the very picky about color in the tank).
And for $130 you can do better. Look at the Viparspectra line. They have built in timers and digital dimmers.