Need help to configure aptitude

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cat /etc/apt/sources.list
deb ftp://ftp.us.debian.org/debian/ sarge main non-free
contrib
deb ftp://ftp.us.debian.org/debian/ sid main non-free
contrib
deb [url]ftp://non-us.debian.org/debian-non-US[/url] sarge/non-US main
contrib non-free

[code:1:b4c987e98b]cat /etc/apt/preferences[/code:1:b4c987e98b]
Package: *
Pin: release a=sarge
Pin-Priority: 900

Package: *
Pin: release a=sid
Pin-Priority: 800

Package: *
Pin: release o=Debian
Pin-Priority: -10
[code:1:b4c987e98b]cat /etc/apt/apt.conf[/code:1:b4c987e98b]
APT::Default-Release "sarge";

However, when I do [code:1:b4c987e98b]aptitude show ~Awoody
~n<packageA>[/code:1:b4c987e98b][code:1:b4c987e98b]aptitude
show ~Asarge
~n<packageA>[/code:1:b4c987e98b][code:1:b4c987e98b]aptitude
show ~Asid ~n<packageA>[/code:1:b4c987e98b]they show
information on packageA of identical
version, even when there are suppose to have different versions in
different distributions.

What have I misconfigured? Also, with the settings in
/etc/apt/preferences, do I still need the setting in
/etc/apt/apt.conf?

Thanks !
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