RE: Considering getting back in
Nothing wrong with using old equipment as long everything works. If your engines aren't frozen then I'd think they would run. If it were me, I'd change the Glow Plug and put a few squirts Mystery or After Run oil in the cylinder. I'd let the engine run for a while before cranking up the throttle.
The President of my Club had planes sit that long in his heated basement, and when he brought one of them up last year. It started right up for him. Radio wise if everything works, then there's no problem using what you have.
I'm a bigger fan of the 72mHz radios. To me a 2.4 isn't a proven upgrade because the Market is pushing for us to switch to 2.4 because of the FCC preasure to free up the airwaves for mobile phones. Mobile phones have a "Wink, Wink" relationship with the FCC.
Plus all that was written about 2.4, I only trust them for indoor flying dispite the nice features a 2.4 radio has. JMPO and JMPE
Pete