I use that skimmer on a 29 gallon sps tank, it more then does the job. It is slighty louder than I had hoped, but the tank is right next to my sofa. If you have the budget, you could look at the smaller deltic skimmers.
Just some advice from someone with a similar size tank, reconsider your lighting, 250 H would be more than enough, I get away with a 175. Evaporation and heat will be major concerns with a 400, especially with only a 10 g sump.