I use Avira, because of its high detection rates thanks to high heuristic.
As for "missing AS" modul, I use SuperAntispyware Free and PrevxCSI.
There is one "bad thing" in Avira, that it can not delete threat automatic.
A user intervention is needed, that is why I instal AVG Free to my friends.

Related to the adware part, you can disable it like this:
http://www.elitekiller.com/files/disable_antivir_nag.htm