I had the same exact question, ran into limitations on vendors that make 20" hoods.
My goal was to purchase a bright canopy (non pendant, non clip on) as my wife hates open top tanks and was fighting me on this.
So i researched and went with Current USA Sattelite 20" 80 Watt.
So far, so good, bright and build quality looks good.
Fan is rather loud to me, however, the look on my 10 gallon is rather nice. Fits perfect.
Note:
I hear the Coralife 96 watt single lamp has build quality issues.
My second choice would be the Current USA Sunpod with Metal Halide and Actinics. Might upgrade if I build a canopy to hide the light.