Like twistr said, you will get a lot of different opinions. Here's mine

I started out with Airtronics and that's is all I have ever used. It does everything I need so I doubt I'll be changing anytime soon. I'm currently using a RD6000 Super. It's 6 channels, and can use either PPM or PCM receivers. I can't remember if it has an 8 or 10 plane memory.