i currenly only have 3 w/G and i have blue chromis, Kenya tree, mushrooms, zoas, a leather, and a hammer, and a mass of GSP growing by the minute..i am not saying it is a good idea though, and hence my newest purchase..but those will live under atleast 3 w/g...not sure about 2 w/g though..
next week i get the 150 MH though...and everything including myself will be much happier..
but i would definately look on that website where you can buy and sell auction items to find a relataively cheap lighting fixture that would keep you happy..i just thiss week saw a 70 w MH system going for 50 bucks...just keep your eyes open for a good deal..