In LA don't forget:
JJ Machado.
Cobrinha.
I have a friend at Cobrinha's (they trained a few placed prior) and he tells me the no-gi training there is absolutely top notch and unlike anywhere he's ever been.
I don't know what to think about this thread. The answer to this is probably the same answer for the question, "where is the best place to train jiu-jitsu"?
I hate to harp on this, but the best jiu-jitsu is where the best jiu-jitsu is. While gi and no-gi have differences, it's all jiu-jitsu. These days if you go to any top academy you're going to get the best instruction. Sure, we can discuss all these little minute things (that will largely be opinion) about whether or not the no-gi classes are better at Cobrinha's or Atos, but I think that's missing the point. You're not going to go train with Marcelo Garcia and get good training in one but not the other.
Frankly, I don't really know of any no-gi only schools, besides 10th Planet. I don't know a ton of gi only schools either. Most places in 2013 do both, either broken up during the week or gi classes during gi season and no-gi during no-gi season, etc.
To play along and answer the original question, I would love to train no-gi with MG, Cobrinha, AOJ, Atos, 50/50, Jeff Glover's spot in San Diego, RMNU (Robson Moura)...anywhere where there's high level instruction and tough, skilled training partners.