WiFi and Wireless are a tad different.
What you want is a wireless router - Netgear, US Robotics and D-Link are all pretty good - most come with an inbuilt Firewall, and some come with security to stop your next door neighbour hacking you and stealing your bandwidth.
If you want a cheapish, but GOOD broadband connection I can help you - you know my details, just gimme a buzz.
Broadband is all about contention ratios - 50:1 = Standard - 20:1 = Business spec and good home standard.
If you live in a big house with thick walls, a repeater might be required, and these can be about £70 so mioght be worth borrowing one to check what you need first.
You then need a card for your laptop or desktop and you probably want 54mbps speed on it for the future more than anything (you wont be downloading at 54mbps)
If you want a quote or something gimme a buzz.
Brad