Just make sure it's not an ADSL broadband router and if you want wireless connectivity buy a wireless router and wireless NIC or adaptor for the PC.
Have a read through here
http://www.cableforum.co.uk/forum/article.php?a=74
and then put
wireless router
into the search forum box up the top of the screen and check out the different questions and answers given to people asking for advice. It's horses for courses a lot of the time but you will then have a better idea of what you need to buy.