If you're just using audio of you, you may want to consider using a quality headset microphone. Something from Sennheiser, Sanken of DPA for example will vastly improve your audio, you will likely have to provide power to it through an adapter. The audio DI box and using a battery should eliminate the ground hum. Good luck.
For video editors, finding the perfect portable workstation is like catching a unicorn. It is no easy task to find the perfect balance of performance vs price point.
