www.ebuyer.com

or EuroPC

Basic laptop will do you, 512mb RAM if windows XP, 1gb minimum if running Vista.

Acer's arent too bad, steer clear of any of the PC world own brand shite like Advent, E-Machines etc etc

I swear by HP personally, i've got an hp business notebook from work thats the dogs bollocks but a bit out of your price range, but the lower spec models will do you just fine (presario range etc etc)

Steer clear of anything Celeron also, theyve got fuck all cache so run like shit. Centrino or AMD Turion are the way to go.

As for wireless, sky, orange, BT etc will all give you a free wireless router when you sign up or migrate your current ADSL service to them. If your on Cable, but a Linksys WRT54G off ebay for £40 and its job done