Hi
What we have been using for SDSL (and its variations like g.shdsl)is the 828 router. This has a fixed dsl port and is quite cheap.
However this has gone end of sale and will transition into end of software maintenance in March 2007.
There are plenty of Cisco resellers who will still offer this product (at a decent price too).
The replacement router is the 878.
You could go for either, the 828 goes end of life in 2011 so still has a role to play for a few years to come.
hope this help, please rate if does
Stuart