It's funny, I actually took realestateu as well, and yes http://realestateu.tv/sponsoring-brokers/ are all pretty good recommendations.
The article I've included below has some very valid points for what you should consider before choosing a sponsoring broker, whichever route you take. For example, did you know most firms have hidden fees that they simply don't disclose? Even the biggest firms will all have hidden desk fees, it's just not disclosed anywhere.
Plus, what's the game plan after you join? How will you win clients as a new agent?