National Brokerage is a very good outfit, I worked with Lance Barton before he merged with Mountain and became one of the Principals at National. Their commissions are in line with most BGA's and I use them for my regular business. I have also found a "boutique" BGA that I use for my larger cases since they pay a much higher commission and are a bit more experienced at handling the larger more complicated cases. I have found that it is a good idea to have several options and not be tied to any one BGA.