i just bought a dell inspiron 2200 from www.dell.co.uk/outlet/ for £299 or so.
at the moment they are doing free delivery and |£55 quid off of all systems. keep checking here as the stock availiable seems to change every hour or so.
With regards to wireless capability ndiswrapper is a godsend and allows you to use windows drivers for otherwise unsupported wireless chipsets. running on ubuntu it has handled any broadcom chip i have thrown at it. Rick