Thanks for the advices!

I'm going to buy a completely new PC, so choosing fitting components will be rather hard. That's why i looked for some premade configurations, and found this:
- Quadcore AMD Phenom X4 9550
- Socket AM2+: AMD770 ATX
- 2GB RAM; 500GB HDD; DVD-RW
- CR x-in-1 //i have no idea what's that

- ATI Radeon HD3850 512MB PCI-E
not bad IMHO, but the price seems suspicious to me (only 550 euros). What do you think about it?