I'm all for honesty so it irks me that some of these closings aren't used more often:

Nonchalantly, (on a get well card from people at work)
Irrationally, (when HR sends out a new company policy)
Malevolently, (when the phone company announces rate hikes)
Perversely, (when I write to...er I mean, somebody sent me a letter like that once... blush )

I like to say things a little differently
The Saga Retold in Limericks