Could you help me with the hardware for an Arcade/Dolphin build?

[Gardenmine]

Hi guys,
I need some help from you all since I'm quite new for Dolphin emulation.
Straight to the point; I'm building an arcade machine to relive my old times and have fun with my friends in my mans cave.
I would like to be able to play all Gamecube games as well as PS2 ones (Dolphin and PCSX2 emulation).
I'm not interested in Wii at all (i already have a Wii and I enjoy every moment playing)
Since I'm in process of assembling the hardware required, I spent some weeks online trying to understand what to buy.
I understood that CPU speed is more important than GPU; was looking for something around 4 Ghz processor but I would like to stay in a low end budget (around 300€).

This is the configuration i identified right now:

• Motherboard Asrock Z370 Pro4
• Intel Pentium Gold G5600, Dual Core, 4 Thread, 3.9GHz, 4MB Cache
• Corsair Vengeance LPX, 16 GB (2 X 8 GB), DDR4, 2400 MHz
• GeForce GTX760 (i have it at home from an old build)
  

Is this configuration ok?
If you think that I should change some component with better performances (or if I did some mistake or if I'm overkilling it), please, feel free to drop your suggestions. (always considering the budget)
I reallly need some help since I'm making my first steps in this world.

I thank you all in advance