With ADSL, one factor to consider IS that many supplied "modems" are USB only - with ethernet to ethernet routers being no use.
If Ethernet is the connection, another forum I visit spotted a very cheap BELKIN router available from UK's "JUNGLE" - not sure if they also have foreign branches
h**p://www.jungle.com/webapp/wcs/stores/servlet/ProductInfoDisplay?catalogId=10001&storeId=10001&productId=11209937000&langId=-1&itemId=11209937001
I believe there are also combined ADSL router/modems - a useful answer if YOU are proving the kit if there's an alternative to buying/renting theirs.