Efficient Bookshelfs on a budget?

I have just bought a panny 42" plasma and need some speakers to go with it. The problem is that I just spent 4k on the TV and don�t want to YET spend big $ on the complete audio system. The panny has a 7.5watt output and I would love to just run some bookshelf speakers directly off of that. The volume in the room will be very moderate but the room is pretty big and opens into another room so if there are any moderate or high efficiency speakers that anybody can suggest with a good sound please help me out.

Thanks
Eric Baer