APU 7860K Need some help to build this

[mcrvr3]

Hey friends, I'm building an HTPC with the following components:

AMD A10 7860K FM2+ "Godavari" CPU (Quad Core, 3.6 GHz, AMD Radeon R7 757 MHz, 65 W)
https://www.newegg.com/Product/Prod...P48975&cm_re=7860k-_-9SIA2F84P48975-_-Product
Main use for a 43" Plasma with lots of BD films and only for light gaming when I desire.

RAM DDR3 Corsair Vengeance Pro 2X4GB 2400Mhz
https://www.newegg.com/Product/Prod...m_re=corsair_ddr3_2400-_-20-233-605-_-Product
I understand that an APU has its performance greatly improved when using high-speed RAM.

3 Hard-drives
HGST Ultrastar 2TB
https://www.newegg.com/Product/Prod...&cm_re=hitachi_2tb-_-1Z4-001J-00029-_-Product
Seagate BarraCuda 1TB
https://www.newegg.com/Product/Prod...9010&cm_re=seagate_1tb-_-22-179-010-_-Product
Seagate BarraCuda 500GB
https://www.newegg.com/Product/Prod...11&cm_re=seagate_500gb-_-22-179-011-_-Product

ASUS DRW-24F1ST
https://www.newegg.com/Product/Prod...7135305&cm_re=asus_dvd-_-27-135-305-_-Product

Now, I must decide between these two Mobos:
Gigabyte FM2+ mATX GA-F2A88XM-D3HP
https://www.newegg.com/Product/Product.aspx?Item=N82E16813128894
Gigabyte FM2+ mATX GA-F2A68HM-H DDR3
https://www.newegg.com/Product/Prod...763&cm_re=GA-F2A68HM-H-_-13-128-763-_-Product

Which would you recommend to properly OC the A10 7860K?
My intention is to spend the lowest budget possible, but I'd pick the F2A88XM if it is needed.

Also, I'm plugging a 5.1 Logitech Z506 Speakers
https://www.newegg.com/Product/Prod...4185493&cm_re=z506-_-19S-001J-000V8-_-Product
The F2A88XM has 5 audio connections for a dedicated 5.1 system and the F2A68HM only 3 that I'd have to configure with the driver. Would it make some quality difference?

PSU
I need help to decide which wattage I need for this gear, with or without OC.

Case
I have to choose between two alternatives, one that contains 2 fans front/back of 120mm, the other having 3 fans, front/back of 120mm and side of 200mm. You can guess which one is slightly cheaper, but once again I'll get the right one for an OC.

I want to be certain and not configure risks, if these specs aren't enough I prefer not to mess with OC at all.

Any comment of you wise O'Clockers will be received with gratitude.

 

[mcrvr3]

Any advice would be of great help, friends.