If you go by the dragonballz.com website (Oh I dunno, I haven't even seen past the Cell games), here are the Sagas in the order they happen:
Saiyan
Namek
Ginyu
Freiza
Garlic Jr
Trunks
Androids
Imperfect Cell
Perfect Cell
Cell Games
Great Saiyaman
World Tournament
Babidi
Majin Buu
I grouped em in roughly the sorta smaller saga groups most people know em as.
In order of favourites, from the above, I have to say:
1. Saiyan (The first fight between Goku and Vegeta, plus Nappa kicking everyone's asses)
2. Ginyu (the ginyu force roxx0r)
3. Imperfect/Perfect Cell
4. World Tournament (comedy value - like Satan falling on his ass lol)
5. Freiza (Despite the sucky length of Gokou vs Freiza fight. ZZzzz)
And now, the suckiest:
Great Saiyaman Saga (What a pile of crap!)