If you get the expansions... just get the game of the year version (has morrowind and both expansions)
I think it costs the same as one expansion by itself.
As for the expansions, the first one (can't remember the name) was ok
Bloodmoon looked VERY cool I like wintery stuff. But I never finished it.
Actually I never beat the main quest in Morrowind now that I think about it... there's just so much stuff to do and I kept getting sidetracked