Referring below, to me a6400 is a no brainer.
U will buy certainly buy new lens later on anyway.
play around with the kitlens , get familiar with the camera & features.


Pros of a6400 over a6000
+ flip screen
+ touch screen (for adjusting focusing point)
+ faster AF
+ more AF point
+ better Eye AF
++ 4k video
++ mic input

Advantage of a6000
+ cheaper

awesome
do update your journey on the Sony thread
and post any questions or if u require any assistance.