Toker1 gave you the best advice. Start a little small and grow into it.
I understand better now what your goals are, and here's how I'd get there. First I'd set a budget, and try hard to stay within it. The sky is the limit with what you can spend on this hobby and setting a cap on the $$$ investment will help you make good decisions. I'd go with the 4 x 8 tent and get an inexpensive 1000W dimmable electronic ballast that'll power a MH or HPS bulb, with a good vented reflector. I'd get a good 6" can fan, paying attention to the air volume it can move, and the noise it's going to generate and hook it to a good carbon filter. They're not all equal and good equipment will have the numbers available, so you can compare. Dress out your tent with all the little stuff you mentioned and build a basic 4 x 5 gallon bucket RDWC setup with a decent sized control rez in one end of the tent. Run it with the genetics you've selected, feeding them whatever you prefer and see where you're at after at least 2 or 3 runs. Then you can make some educated decisions about how to get from an easy pound, to 2+, and you'll have the basics to get there.
Maybe you'll discover that you need supplemental cooling or heating or a dehumidifier or a chiller and maybe you'll see that you don't. You'll only come to those conclusions by actually running in the environment where you live and grow over a period of time.
Here's a good example of a limit on my grows...humidity management. I'm in Alberta, Canada and during the winter, it's 30% RH in my basement, pretty dry to start seedlings, so I throw a desktop humidifier in my room when I kick them off. Six weeks later, the room is pretty sweaty from the plants and room temps are high. You know what I have to worry about then? I worry that the vent on the side of the house is going ice off, block the exhaust and my plants will get fried. Not something I foresaw when I thought about my grow room humidity. Should I buy a dehumidifier, heat trace the vent, bring in a new cooling air supply just to cool the lamp and buy all the controls to regulate temps or go outside every night and kick the lump of frost off the vent cap?
The point is, there's no way you're going to realize all the things you'll run into, until you knock your head against them.
I'm looking forward to seeing how you do. Please keep posting as you progress, it's fun to see people get growing and succeed.