if you dont need it to be transported then i wouldnt bother with a laptop, just build a low spec desktop, youd be suprised how cheap they are now and would be more then powerful enough to do what you stated.
i just whacked an example part list together for you, cheap as chips
AMD Sempron 2500+ (SoA) (1.750ghz) CPU Retail inc Heat Sink Fan & 3 Years Warranty £39.25 £46.12
Gigabyte GA-7VM400M-RZ, VIA KM400, uATX, DDR333, 10/100 Lan, USB 2.0, Audio, IDE, VGA £27.96 £32.86
512 Mb Corsair Value Select, DDR, PC2100, non ECC, Lifetime Warranty £27.00 £31.73
Scan 3XS '2012' 4 in1 Kit. Black/Silver inc Keyb/Mouse/Speakers ATX Midi Tower 400W Passive PFC PSU £24.25 £28.49
80Gb Seagate Barracuda ATA-100 (7200rpm,2MB,9ms) - PATA £31.57 £37.09
128MB Gigabyte N40128TE-Geforce4MX4000, 275/400MHz, AGP8x, 2xPipeline, DirectX8.1, TVOut £23.00 £27.03
Net Total £173.03
Carriage £15.00
V.A.T. £32.91
TOTAL £220.94
prices will be similiar from most retailers.
220 quid including delivery, id say that works out cheaper then most laptops youl come across :)