Not so long ago I have been looking to build a new PC for my friend (he chaged his mind later on). The PC would be suitable for normal tasks like web browsing etc but would also be posible to run some les demmanding games. In slovenia it would cost me about 430€ for all components I gues in Germany it would cost even less.
So componets which I intedned to use are:
1. Gigabyte GA-880GMA-USB3 motehrboard http://www.gigabyte.com/products/pro...px?pid=3817#ov
Motherboard has some cool overclocking capabilities supports latest AMD A3+ socket and upto 16GB of DDR3 ram. It also has integrated AMD graphics card which is compatible with ATI Hybrid Graphics Technology which means that if you add standalone AMD graphics card also capable with this technology bth of them can be used to speed up graphics processing.
2. AMD FX 4 Core black edition processor http://products.amd.com/en-us/Deskto...&f10=&f11=&f12=
This processor is from the latest AMD processor family and has great support for Open CL technology. It can be comparable with Intel i5 processors but has a bit lower price.
3. WD Caviar Blue 1 TB, 7200 rpm, 64 MB, SATA III (WD10EZEX) hard drive.
4. PRO-925B - ATX Pro-Line casing http://www.lc-power.de/index.php?id=323&L=1
The casing doesn't look like much but it does support good coling capabilities.

While the above configuration isn't suitable for serious gaming it can be easily upgraded by adding standalone graphics card (I recomend using AMD based graphics card to make most of it - AMD chipset on motherboard and capability of using both integrated and standalone graphics card together), adding aditional RAM and exchanging CPU for 8 core AMD FX processor.
NOTE: 430€ of estimated cost is only for Computer tower without CD/DVD writer(whic would be reused from my friends old computer), no Monitor or other periaphal devices.