Hey Tom, welcome back to RC! Sparky is right, the Kadet is an excellent re-starter.
Mike - at least some of what you are looking for is dependent on the brand you choose.
Analogue servos you are familiar with, they have been around for decades. Digitals are stronger and are programmable themselves. Unlike analogues they will fight to hold a position - but all that is at the cost of power consumption (need for a higher capacity battery)
There are bus-systems that I do not fully understand myself but offer great advantages in certain situations.
Oh - most 2.4 radio systems have their own discrete signal pattern, meaning you can no longer use a Hitec Rx with a Futaba Tx - they are brand-dependent.
I recommend to both of you to find a local club and join, or at least hang out and talk, they can answer specific questions but you will still need to do research.
Lastly - take a look at the site supporter program ( LINK) - the small investment far outweighs the benefits!
__________________ Jeff
Castro Valley, CA
The essential paradox of our democracy is that our warriors fight and die for our right to dispute the cause for which they are fighting and dying.
Let me know if I can help
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