I had great results from AK-47 (Serious Seeds), and feminized Grapefruit (Female Seeds.nl) in a hydro grow. AK-47 was a big yielder and easy to cultivate. No growth issues, no nute-burn, deficeincies. I wish I could find the same strain in a female or feminized version. I'm growing Skunk Special feminized right now because I saw some awesome results by another grower on this message board. I too am looking for the ultimate strain (quick yield).