Here is what I'm considering now.
AMD Athlon 64 X2 6400+ 98 Euros
AMD Athlon 64 X2 6400+ Product Details bij Mycom
mainboard ASUS M2N 60 Euros
ASUS M2N Product Details bij Mycom
RAM memory Corsair 2 GB XMS2 TWIN2X2048-6400C4 45 Euros
Corsair 2 GB XMS2 TWIN2X2048-6400C4 Product Details bij Mycom
DVD burner LG DVR 22X DL SATA 25 Euros
LG DVR 22X DL SATA, Retail Product Details bij Mycom
WD 1TB,Caviar GP 80 Euros
WD 1TB,Caviar GP Product Details bij Mycom
ASUS EN8500GT SILENT MAGIC/HTP/512M, 512 MB 56 Euros
ASUS EN8500GT SILENT MAGIC/HTP/512M, 512 MB Product Details bij Mycom
case for all of this...stuff Aopen QF50C - Black incl. 400W PS 55 Euros
Aopen QF50C - Black Product Details bij Mycom
total: 419 Euros