For me, it's Max and Liz completely. They weren't always making out in closets like Michael and Maria were, but during their hot moments, it was...HOT!!!
![Twisted Evil :twisted:](./images/smilies/icon_twisted.gif)
There was also so much opennes between Max and Liz that made their passionate moments so much more intense for me. Michael and Maria didn't really have--at least Michael didn't really--until the end of season 2 and season 3. Also, I wasn't really attracted to Michael until season 3 when he finally grew up and started being person I thought was good enough for Maria. with Alex and Isabel, they weren't really hot, but they were cute--at least when Isabel wasn't messing with Alex's head and heart.