Thanks to everybody!
I got assembled a machine with following configuration (with the help of my suggestions and assembler's belifs):
Processor: Intel i3 2100
Motherboard : Intel DH67BL (with SATA 6.0 GBPS and USB 3.0, 7.1 channel Audio, HDMI & DVI ports, S/PDIF optical port)
RAM : EVM 2 GB
HDD : Seagate 500GB (ST500DM002)
Optical Drive : LG MODISK optical Drive
Grafix Card : Asus 5450 (1 GB)
Monitor : Samsung 22" full HD (purchased last year)
Case : iBall Grandeur with PSU
Pls. see whether it is ok or not. I had some other brands in my mind for RAM and PSU but as u know the assemblers insist for the popular ones. I compromised on that because I have moderate graphics use, no heavy gaming, only pictures and video editing a little bit.