1- the servers are under stress atm, so it's possible to see some unusual behaviors.
2- you edited the repos wheezy and/or testing, but from what?
3- what was your original sources.list?
4- when was the last time you updated? you mentioned testing/wheezy, so i assume you're not using UP
5- you sure know how to use aptitude
and did a sudo aptitude update before the sudo aptitude upgrade (that should be replaced by full-upgrade but that is another war