There are many. When you fly to Municipal pretty much all of them there are good. Some are busier than others.
John Wade springs to my mind, but he has a lot of clients (not always available): 600 5512, others are: Spanish: 622 5618 or Gonzalo Heredia: 610 2008, Gerald: 600 5501, Tom (not sure if he's still there): 606 2947.
Rate, pretty much BZ 8 per ride now, BZ$ around 60 for half a day, please others, correct me if I'm wrong.
Hope this helps,