Basic kit contains all electronic components, PCB, potentiometers, jacks, knobs, switches, etc. needed to successfully assemble the unit. All you need to provide is the enclosure. Basic kit contains everything but the aluminum enclosure.
Version 1: Version 1 of the kit comes with the PCB mounted DC jack.
Version 2: Version 2 of the kit comes with the panel mounted DC jack (i.e. DC jack is mounted to the enclosure and not the PCB) and wires necessary to connect the DC jack to the PCB.
Premium kit contains everything in Basic kit version 2 plus pre-drilled enclosure with artwork.
With the hand-built unit you will get a unit that is hand-built in the USA and tested before shipping.