I've gotten 3 friends hooked by using the Lee vs Garaa eps.
You only have 4 eps so make them the ones with the most action. People dont need to know the build up to enjoy intense action scenes.

The first meeting of Zabuza works well to (the ep where naruto Henges out of being a shriken)

Edit: Also having people watch from the start is a bad idea, I had to force one of my other friends to watch 12 eps before he got hooked. He thought the first eps were boring and mildly entertaining.