Suggestion for ADSL modem, modem/router, w/ disableable router; wht hpns w 2 routers?

[Mancora]

At my work we recently did an ISP change and our old modem only supports up to 1.5mbps, and we have a 6mbps connection. ATT did provide us a with a modem router combination, buuut we have a SonicWall SP 170 router, with anti-virus and a few other protections provided through that router. So we want to keep this router and I think we need to purchase a ADSL modem (or modem/router combination where we can turn off the router functionality) to get this up and running again.


Is this correct? I'm starting to regret sleeping through my networking classes some time ago and I'm not sure what would happen if we hooked up 2 routers to each other, but the two "techs" (I'm not impressed of their knowledge level from what I've seen) I've talked to seemed to say this was a bad idea.

Right now I'm bypassing the SonicWall router and just using the ATT provided modem/router.




I've done some checking around for a modem, and damn it seems hard to find decent stand alone modems, so far the best I've seen is this D-link modem where a number of people were complaining that it appeared to block access to certain websites...