I wouldn't suggest a DX6i... I've done a lot of tech checks... and seen a lot of people have fail-safe issues with them. At the cheap end of the market the DX5 failsafe's pretty well... I've used a dx7 with good success, i now run a dx8, which is a real good TX... if i was to upgrade now id probably go for a DX9.

Also, I've not had a problem with orange RX's so far.