I'll come in on the side of the people still using 72mhz. I also don't see it going away anytime soon and Rx's are already starting to get a little cheaper. I leave my TX(futaba 9c) on one channel and just buy the same channel RX crystal for all my extra RX's. Would cost me well over a thousand just in recievers to change over. For someone just starting out though you might be better off with 2.4 unless you think you'll be getting alot more planes in short order. The increased cost of RX's wouldn't be as bad if done over a period of time. As others here have already said, it really depends alot on your local flying situation.