I'd highly advise a Linksys router. Do you want a wireless G or N router?
I have one of these, and it's brilliant, especially with DD-WRT firmware:
http://www.ebuyer.com/product/103185 (Though it's only wireless G)
If you want Wireless N, than I'd advise:
http://www.ebuyer.com/product/142702. You can even get a free PC game with it. Or, you could save £5 and get the same router without the game.
http://www.ebuyer.com/product/175807