I'm thinking about either buying me a laptop or this config:
1 x Intel Core 2 Duo E6600 (2,4GHz, 4MB Cache, Box)
€ 206.00

1 x Antec Sonata 2 + 450Watt
€ 95.00

4 x AIOS 1024MB DDR2 667Mhz (Kingston)
€ 158.00

1 x Seagate 160GB SATAII 8MB
€ 49.50

1 x Asus P5B
€ 97.00

1 x Acer AL2216Wsd
€ 282.00

1 x MSI NX8600GT-T2D256EZ
€ 154.00

Total
€ 1041.50

Considering price differences in the US and here, I'm guessing this should come in around your budget?