I just watched the full Naruto vs Pain and I've got to say this has made me want to watch Naruto. I'd only watched about 10 episodes before and then stopped.
The amount of feels in Naruto vs Pain was so damn high, even with only basic knowledge of the character relationships

Should I watch every episode starting from the beginning or can I skip any chunks (fillers etc.)?
Also, Basilisk The koga ninja scrolls is pretty good/interesting - watched like 11 episodes straight last night.