The strains that I've found easiest to grow are:
1. Lowryder - I know it's nothing special, but in 2 months you've got 10 grams off 1 plant and all you really have to do is water it. If you wanna go pro with it, good light, nutes and other stuff you can get 15 grams.
2. White Rhino - Amazingly strong. Or, as a guy said after smoking some "I can barely feel my face...". Pretty easy to grow, stays very small, under 60 cm (2 feet), but it does require alot of nutes and light, since it grows sturdy as a tree.
3. Super Silver Haze - Grows very, very fast, but keeps under 7 feet. Best possible high, a perfect combination of indica and sativa. Never had a problem with this strain.