Chartered a wonderful EFIS equipped TB20 in Germany the other month, it had an ADC... the works... even a display for various engine parameters (ie. temps of each cylinder!!!!)...
Last type I flew was the 744, imagine the grin on my face when I took a first glimpse into the posh cockpit!
Be aware that the EFIS and anti-icing equipment, when fitted, will take close to 100 kg off your published payload!
