Sorry I went quiet, I broke my laptop (also why I haven't updated my grow journal either!)
Answer to your first question: I said "it sounds like you have a small grow space so you're not going to grow very large plants." You won't be able to grow a plant 4ft tall and 4ft wide plant in your grow space, that's all I meant. I'm not saying you aren't going to grow nice plants, but you don't have the space to grow anything tall, or wide. Once you add in the height of your res and how low your light hangs, you prob have a lot less than 4 ft of vertical space to grow. So if you can only grow smaller sized plants you could prob fit two plants in that bucket rig you were going to buy, that's all I meant.
Good job on the equipment purchase!!!
Do you still have your old res or did you get the new one? if still the old one did you upgrade the air pump?
Your water ppm is pretty high. Do you have access to reverse osmosis water? An R/O filter is $150 - you'll just have to live with it otherwise. Try it and see how you get on. If your water is chlorinated make sure you let it sit for 24hrs for the chlorine to evaporate. The high ph is not a problem. Once you add your nutes (which should be acidic) the ph will drop. You will need some ph up and ph down to adjust your ph to the desired range (5.8-6.2) after all your nutes have been mixed in.
Good choice on the Widow, I've grown it before.
I'll post a link to my grow journal when I get my new laptop and get the journal updated - you can prob get some ideas for your garden from mine, or other growers'.