hahaha u got your answer of what u need already  you wont regret with A6k, the flash u say wont buy now,.... eventually 2-3 month later u will start asking here which flash is good for your A6k hahaha its been a repeat pattern in Sony thread.

but i need to correct something for u, i dont know where you read the selectable 179 point.  the 179 points is not selectable. you only can select the 25 contrast AF point, the 179 point will asssit the 25 point from behind. no such thing as scroll till you die. A6k user please verify this. as far as i know (from the prototype model that i was testing...)
the 179 assist af point only work in 2 AF area mode, both require to be in AF-C. one is the Wide area AF, one is Zone area AF. the zone is group into 9 squares... and its damn easy to navigate in the 5x5 box area. this was my finding during the test. the 179 will assist in the zone 9 square mode.

im shy shy... lol



(edit: not sure what i did wrong, the video wont play, here the direct link http://youtu.be/MMCJ2mm8I7s)

the idea is that, with (physical)filter, you are limited single color cast/alteration. but with photoshop u can do targeted contrast.

(sorry for shaky video, use phone to record coz desktop record will end up recording my 3 monitors and many 'ahhhh...')

i made a lot mistake in the video... mini panic attack  unscripted video 

1:15 - very over exposed
2:05 - super-ly, ultra-ly... 
2:28 - attached deteach (docked or undocked)
3:56 - from the phone(-camera, not font)