Can you number your budget in USD?
OK, I saw about how much is it.
You need a Sandy Bridge i5 CPU /like i5 2500K/
A P67 motherboard.
At least 8GB RAM
A decent multypurpose graphics card like GF 560 or 560ti /or a 460 may do the job and is cheaper/.
Good idea is to have 2 HDDs for RAID 1 or just backup.
You need also a good monitor - at least 22-24" with a resolution of 1920x1200 and with good color gamut /meaning IPS/ but these are expensive /with HP being maybe the cheapest and not bad/ and your budget may not cover it.