In my suggestion go with this config for your assemble PC.
Processor - Intel Core i3-3220 - 6.5K
Motherboard - Gigabyte GA-B75M-D3H - 4K [You can see the Specification in given link below]
Gigabyte GA-B75M-D3H Motherboard
RAM - Corsair Vengeance 1x4GB [CMZ4GX3M1A1600C9] - 1.4K OR Corsair 2x2GB [CMX4GX3M2A1600C9] - 1.6K
HDD - Seagate Barracuda 7200.14 1TB - 4.3K
Optical Drive - HP or Sony - 1K
Cabinet - Bijli with PSU - 1.6K OR NZXT Gamma - 2.4K
PSU - Corsair CX430V2 - 2.4K [It's good for 3 to 4 years, because it's warranty is upto 3 years]
Monitor - Dell 20 inch IN2030M LED - 6.4K [For this monitor features you can go with the link given below.]
Dell 20 inch IN2030M LED Monitor
Keyboard+Mouse - LOGITECH MK200 - 700bucks
If you want to buy UPS and Speakers.
UPS - MicroTek Dual battery 800VA - 2.7K
Speaker - Altec Lensing BXR1221 - 1.1K
Hope this help.