[MetalMan]

About a year or so ago I purchased a Nomadio React radio. It isn't exactly cheap at $300, but with this radio you certainly get what you pay for (and it helps that I got mine for $260). For its features, it's by far the least expensive radio out there...

-telemetry including RX voltage, main battery voltage, RPM measurement, and temperature measurement
-vibrating/audible alerts that can be set when a certain temperature or voltage threshold is reached (completely programmable)
-very lightweight with the included 4cell NiMh 800mah pack, I have a 2s 2100mah Lipo in mine with a 5v switching regulator and 2s Lipo alarm. Mine has almost no self-discharge, and I hardly ever charge it.
-compact compared to pretty much all other radios out there
-computer interface for programming the TX's settings and for firmware upgrade-ability
-compatibility with Spektrum RXs means that you can get a lot of receivers for cheap (I've bought some from coworkers at the LHS for $20 each)
-super adjustable settings for everything, with the ability to do whatever mixing you want (even for a RC tank!)

Downside:
-looks kinda weird/cheap

This radio has enabled me to do so many things I could never imagine doing with any other radio, without totally breaking the bank.