I had a Futaba 3PK and used it for quite a while. I sold it and bought a Spektrum DX3R, and was severely dissapointed. IMO, the quality is just not up to the same standard as my Futaba. As I've said before, I feel like a sold a slightly used Bentley and bought a new Geo Metro for the same price. Maybe that's drastic, but it's kinda like going from a Rolls Royce to a Cadillac. The Caddy is a nice car, but it's a big step down from a Rolls. For that reason, I'm about to sell a nearly brand new Spektrum DX3R and buy the new Futaba 4PK. I also had a Futaba 3PM, and it's a great radio if you're on a tight budget. The 3PM FASST (2.4GHz) is only around $170. You can get the FM brand new for about $120, and used for under $100, but you'll have to worry about channels and such.
If I were you, I wouldn't buy anything except 2.4 GHz.