Actually, U Don't Need to much Ram to run Minecraft.. 8 GB is suitable to run heavily Mods...
But U must choose a good processor. Also that motherboard is suitable your processor type.
About Graphic Card... I recommended buy EVGA (Nvidia also can, But I use nvidia to play... 3.3 OpenGL Version...)
Don't Buy HDD , Buy SSD will better...
HDD process speed is slow but SSD process speed is fast.
Do U Really Need Use too much USB Ports??? 6 USB Ports... ,4 is Okay... Lol