Your house your rules.
1200 + cfm is a lot of air. Last hood I bought ( $900 ) had a 3 speed motor, some have 4 speeds. If your interested in really exhausting the heat and vapors I suggest that you pay up for a real hood and start planning for the exhaust duct that will be needed. My hood required a 10 inch duct. I was very pleased with the performance when my project was finished. The one I bought only moved 950 cfm's. High really made some noise, but with all of the gas burners going there was little heat pumped into the kitchen.