I picked season 2 because eventhough Brenda and Dyaln started dating in season 1, they didn't fall in love until season 2 and become a real couple. I loved Brenda and Dylan together, they made the show worth watching every week.
I voted season one mostly because it's the season that I have seen most episodes from the last couple of months. I love the early seasons of 90210, in other words the ones with Brenda. I think it just became to much after she left. Everybody had the same problem one time or another.
/Anna
1. Season 2
2. Season 4
3. Season 3
4. Season 6
5. Season 1
6. Season 5
7. Season 7
I'll have to add the rest as I watch them on SOAPnet. BTW, I must say that seasons 5 and 7 are the worst pieces of garbage I've ever seen. I can't believe the show was ever this bad.