When you are talking about a router an a modem you are talking about 2 very different options here.
Modem will offer a direct link from the DSL to your computer commonly through an ethernet cable (CAT 5e or CAT 6 etc etc...) or through a USB port.
Router will take the internet signal from that one connection and can act as a hub to split the connection to 5-6 ports some even allowing wireless.
I would agree with TEG you defiantly need to see if ATT can offer you a new DSL Modem. I am not familiar with the 2wire units so I can not speak from experience. I've always had cable internet. (Typically much faster than anything DSL has to offer in my area at least.)
If you are looking for an EXCELLENT wireless router I would recommend the
Linksys WRT-610N. I have had this router for almost a year and a half and absolutely LOVE it! Completely Apple friendly! It has 2 physical radio antennas that will allow you to setup 2 networks if you like. You can set either / both to the G, B, A spectrum for older devices or both to N only or any mix between. I personally have an 'N' only and the second that supports B, G, and A for mine and my girlfriends iPhones and for anyone who brings their laptop over that I don't want accessing my personal files. The other antenna is solely for my iMac, MacBook Air, and Apple TV (and it keeps up with my demands).
The reason I chose this option was because of the bottleneck issue where your network can only run as fast as your slowest device.
PS: the link is to a YouTube video that will explain everything about the router.
You can go with the Apple Airport Extreme, but it is $179 new vs. $155 for the Linksys on
Amazon.com and will so the exact same thing. . .