CPU: i5 2400 (i5 2500 ~300 more)
MB: Asrock H61M-VS
Ram: 2gb ddr3 1.5v (extra 2gb around ~120 more)
Video Card: GTX 460 1GB (not the SE version) or HD 6850 (HD 6870 ~200 more)
DVD: Use old 1 if u have
Case: CoolerMaster RC-370-KKN1
PSU: CoolerMaster RS-460-asaa-d3
around 4100HKD(price from price.com.hk)
+ hdd WD WD5002AALX 500gb black or any that fit your need/budget.
If you want overclocking then you will need i5 2500k + better heaksink/fan + p67/z68 board which = more $$$. =)