Hitec Optic 6 TX w/ Spectra module.
This radio has just about every program option most sport flyers will ever need. The spectra module is the way to go,as you can just dial up the frequency needed. Take several models to the field, but just one TX. About the only shortcoming may be the relatively small number of model memories (8). Most of the latest systems have 10, 20, or more, but this TX has been around a few years. Now with the 2.4 Ghz rage, a lot of club fields are wide open in the 72 Mhz band, i.e. lots of open frequency channels. The Hitec RX's have also dropped considerably to bargain prices. If you upgrade the TX battery pak later to say a 2500 mah NiMH, you can fly all day.
I give this product 5 stars. Review by Hall, Victor