What do you want out of a broker? Do you want more hand holding, advertising, leads, etc? If so, those that charge a high % of commissions will provide that -- which is why they take a bit of your $.
Personally I just wanted to be left alone. I found a discount broker that charged $50/month or whatever, and $0 of my commissions and I was off to the races.
So really, it depends on what you level of service you're looking for. The more service, the higher % of their take.
I don't have experience with any of the agencies listed. But I would dig into into fees and commission splits. If you can find someone that is transaction based that's a pretty solid. Also, ask if the fees and splits start over each year or if they have any other weird quirks to determine splits that you should know about. I've heard of agencies requiring you to recruit X number of producing agents in order to get your split down.