first of all do u know if ur on adsl or dsl im not sure what the difference is but im on adsl! have a look on ur current modem or modem package it normaly says 'dsl modem' or adsl 'modem'
second of all i would suggest takin a look at either belkin or Netgear! im on a netgear wireless router it works well and i no people who use belkin and they also work well! also belkin u can have the usb wireless areials which have a extention to them for better signal reception!
mayb this topic would be better suited in the networking forum