I'm not too worried about 2.4gHz. The one pilot who shared my frequency in the club went to it so I now have zero wait for the pin and it didn't cost me a cent.

Look for adaptability (programing), digital trims (most now have them - what a God send), availability (can you get batteries, servos, receivers, buddy cords, spare antennas . . . oops), market exposure (unique is cool until it comes time to upgrade, sell or expand the fleet). You can't lose with Futaba, JR or HiTec. Six channels is nice, more is better. Eventually, you will want to play with mixing or flaperons, etc. and you may regret a basic set-up.

I got started with Futaba back in the 70's and have never used anything else (well, there was this one Kraft in my college days . . .). Though I use HiTec high-torque servos for my rudders in most of my models. There can be some overlap among brands - but be careful. Don't mix servo arms between brands.