PPP from Nirvana is also a good one. I have four in full flower in a hydrohut in my spare bedroom - I do use a small carbon filter but there is no odor outside that room. I'm in an apartment so I usually grow sativa dominant strains as they tend to be lower odor. So far, C99, Jedi, PPP, and surprisingly, Afghani Bullrider have all been low odor.