No particular order:
1) Green Day - Dookie (The album that got me into music)
2) Weezer - Pinkerton
3) Rancid - ...And Out Come The Wolves
4) Smashing Pumpkins - Mellon collie... (this album is so underrated. Siamese Dream is also amazing)
5) Offspring - Smash & Nirvana - Nevermind (Can't decide)
Pavement, Cake and the Flaming Lips also put out AMAZING albums but i didn't get into them until the mid 2000s. So, the top 5 albums have more personal meaning.