Make sure you have router with a built in ADSL modem.
Based on a bit of research with friends and colleagues I would avoid Netgear and Belkin. Lynksys is the prefered supplier. Slightly more expensvie but worth it. I have the ADSL router WAG54GS.
Another tip is if you have decide what you want and have a pc world near you go to to website and usualy you can buy on line but pick up from the store. This can save you upto 25%
Bizarly they just go and get one off the shelf!!!
cheers