I take it your going to buy from media markt? or are you going to buy online? online is usually cheaper, depending on shipping... but as it was stated...
E6300 Core 2 Duo
GIGABYTE GA-965P-DS3
2x1GB DDR2-667 (or 800) RAM
7900GT maybe even one of the ATI FireGL cards for the rendering like the V4300 or V5100 cards if this machine isn't for gaming.
A 550-600W Forton or Antec PSU
160-250GB SATA II hard drive(s)
A decent sony or NEC DVD burner