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I had a hard time figuring out of this was a modem + router or just a router. Turns out it's just a router (right?) I need a good DSL modem. I have one already but its got a built in wireless router that sucks! Which is the reason I got this... so what I need is a good dsl modem that doesn't have a router built into it. I went to the store here and couldn't find one (I'm on an AF base in Italy).
In general, your DSL model will be specific to your ISP. They are almost never sold independently. But you can probably turn off the router function of you DSL modem and just use it as a bridge to an Airport.