Well, you also need an exhaust system and of course an air circulation system. With the C02 you are going to need a way to test and control the amount in the room so you will need to have that room hermetically sealed so you get the most from your system.
Me? I put dirt in the pot, germ the seed and it pops up. When it grows enough to be sexed it goes outside in the sun to create the buds that cost me old dirt, old pots and tap water ph lowered with some white vinegar. So my grow costs probably less than one of your devices. Wouldn't buying at a dispensary be cheaper for you?