I have a Freshwater Aqualight on my 2.5 gallon, looks clean with a good DIY mounting job.
I think the cleanest look would be a Current Single Satellite with a Dual Daylight bulb (a little more costly due to having to swap out the full/actinic bulb). I would have done it for my 2.5 gallon but I had a Top Fin 10 filter on the side which fit perfect but wouldn't accommodate the 12" fixture with it on.
I had a 9w (from a Picotope) on my 1 gallon, and had a little algae, but for no CO2 it was very acceptable and not much of it, a little green stuff here and there. I upgraded to a 13 watt Galaxy II, and I have hair algae the likes of which I've never seen now, and I dose Excel and ferts. I think I'm going to drop it back down to 10 watts.