I have a similar requirement, but
(a) cable modem, not adsl (but has ethernet connection to desktop) - does it matter?
(b) desktop is a mini footprint type with no room for expansion. Is there a USB wireless gismo? .......but see (c) below
(c) Richard's boxes say 11g, but my laptop is Centrino 11b. Will that g hub work box with a b laptop?
any further advice ?