I would like to configure an assembly machine chassis: Core I5 CPU , discrete graphics card , 4G RAM , 500G hard drive

My configuration:

Processor Intel Core i5-2380P @ 3.10GHz Quad Core

Motherboard GIGABYTE H61M-DS2 REV 1.2 (Intel H61 chipset)

Memory 4 GB ( Kingston DDR3 1333MHz )

Main Hard Disk Western Digital WDC WD5000AAKX-001CA0 ( 500 GB / 7200 RPM )

Graphics Card Nvidia GeForce GTX 560 SE ( 1023 MB / Sothai )

Sound Card Renesas ALC887 @ Intel 6 Series Chipset Hi-Fi Audio

Network Interface Renesas RTL8168E PCI-E Gigabit Ethernet NIC / GIGABYTE

Mainstream gaming is no problem at around 3600.