So many board choices...

Hey everybody,
I am new to the Arduino scene.
I am trying to figure out which board to get.
I have a washing machine and a dryer that have an end-of-cycle alert.
What I am trying to accomplish is this:
When the washing machine or dryer finishes, it will send a digital signal (I will probably tap into the speaker of the washer/dryer for this) to the Arduino board and then twitter, email, or text message me that it is done.
I don't mind running ethernet cable to my washer/dryer, so I am looking at the Ethernet Shield (instead of the Xbee shield).
So I got the idea, I just don't know where to start.
I got the Getting Started With Arduino book and it doesn't help with board selection or programming for twitter, email, or texting.
My local bookstores don't have the Making Things Talk book.
Does this book help for this?

Thanks for any help...

Alan

I'd suggest the Duemilanove, it's the current model, flexible for other projects and pretty cheap.

Thank You,
I'll look into that board.