Kagbeni is a classic movie.. It gets more interesting as it goes. Movie is actually based upon an English Novel "Monkey claw" and its arguably the first Nepali thriller movie.  Sano sansar is more like a tele-serial. lot of unnecessary scenes. so, u better skip some part if you wanna save time. thats what i did.. About old movies, Balidan and Prempinda are classic as well. I've heard Kanyadan, Muglan, and Numafung are good as well... All these movies are on youtube.