Hey Xtc,
I just started with the AG myself 2 weeks ago. Granted my plants are not very big but they do have 2 nodes and are REALLY getting bushy with no stretching. We may be able to bounce ideas off of each other during this time.
I rooted for 4 days then used Grow big HYDRO and big bloom 1/4 strength for both. With in 2 days of planting I went from seed roots to first leaves. Since then I have been asking ALOT of questions about lighting. The Aerogarden just does not have the intensity and spectrum that is going to be needed for flowering. BUT....it will be plenty for the time being in the veg state. You can buy a 6' figure eight extension cord from radio shack for about $5 and a small chain with some clamps and two small hooks....I used and old dog chain we had and it worked well. With this you can set your AG hood about 1 inch away from your plants. This will also help when your plants reach past the hood limit if it is a big strain.
OK so now they HPS light. I was searching on Craigslist for keywords HPS, Growlights, Hydroponics, Hydroponic....The search engine there is picky and leaving the "s" off of hydroponics actually pulled 3 more listings....they had them there for ALOT cheaper than you can find online....but you are also risking buying something that may not work so pay attention.
Well the best part was while calling around asking people about their lighting systems, I came across a guy who OWNED a hydro store and has a ton of extra stuff for cheap. He can also get nutes and at cost +10%...so needless to say I know where im getting future lights and NUTES!
So after talking to the guy for about an hour I got a TON of info on hydro. This guy was awesome talking about the difference between using a 200 w HPS and a 600 w HPS was going to be a 1lb yield of tomatoes and a 4oz yield of tomatoes.
In other words he was wise to what I was doing and was more than willing to help me in my novice adventures. He also said that the difference between buying a 600w and 200w would be made up within my first trip to the "market" to sell my "tomatoes".
One other thing he said that made since was...using Fox Farm nutes are great, they do a great job with hydro and will do exactly what you are expecting them to do if used correctly....BUT...using synthetic brands like General or DutchMaster hydro nutes will give the plants EXACTALLY what they need without any extras....Once again science has surpassed nature. True you will not be getting "organic" harvest, but seriously if I had a choice, id go for the yield.
Well bud its time to wrap up this novel. I was just excited about my new knowledge and I thought I would share. If you are interested in ordering nutes or lighting let me know.