If you want wireless, of which the faster and newest is Wireless G (8.0211g), then get a Sony VAIO VGN-FS115Z. I recommended this in a different thread, and my mate got one yesterday and he loves it. The Pentium M at 1.7GHz is good at gaming and uses not too much power. It also has built in Wireless G and B, which means whatever network you've got at home it can fit in. It costs £1,167, but that's with 17% VAT and we're usually ripped off over here
IF you get afford it, get it.