Of the listed radio's. The RD8000 fits the budget. Fantastic support if you need it. I have never needed it. It will be on sale for $140.00.

The 9x also fits the budget. The Rx's are $11.00 for 6 channels.

If you out grow the radio, you can upgrade the firmware to add tons of features to it. I flew mine bone stock for a year and a half. I only upgraded the firmware to get more model memories. It did add tons of features.

I have over 2 years now without any issues with this radio. For what I paid, I got way more then what I paid.

Buzz.