I've only watched a few, but my fave is Kabhi Khushi Kabhie Gham (K3G). It's got 3 generations of super stars, and the songs are sooo catchy! It's a dramedy. The drama is dialed way up, so be ready for that. The film doesn't take itself seriously half the time, which I find charming in this case. It's well done.
Another one that I really enjoyed is My Name Is Khan. It shares 2 of the stars from K3G. The tone is much more serious - especially in the second half. Somber and hopeful. Part Forrest Gump, part 9/11.