Ask Slashdot:ISDN and Linux

Hey, it's my turn to Ask Slashdot *grin*. We're seriously considering running a permanent ISDN line to the geekhouse so we don't have to keep redialing and sharing a single tired little modem over 5 users who all want bandwidth. The question is simply what is a good ISDN modem for us? Needs to work with Linux and preferably not to expensive. Who's got experience?