I have a Garmin Rino 120 and I am really impressed with it. I still have not used the two way radio function, but I have heard that it is not all that great. I would definately go with a Garmin. I saw today that academy sports has the base line unit on sale for $60 or so. I dont believe it accepts topo maps but its an option for you. Keep your eyes open, somone always has gps units on sale. From time to time academy has the blue unit that accepts the topo maps on sale for $80-90.