I thought her hair looked cool during the first season of Wings too... kinda a curly permed do... it's sorta like that in this photo of her and I taken back in '99. I also liked the Jennifer Aniston type of cut she got near the end of the 7th season. Crystal always has great hair though.
Steven's hair I definitely loved when it wasn't too long... but he's really cute no matter what.
Tim's hair I liked when it was a little longer... but then I also liked kinda the spikey look he went with during the last season. I always thought he was gorgeous though.
Jen