Any must have games during Steam Holiday Sale?

For those who don't know, Steam is an online store where you buy games and then download them. You can download the games to any computer you want as many times as you want, since your license is handled through a login ID. Every year they have a great holiday sale, and I was wondering if any of you knew of any deals that are too good to pass up.
http://store.steampowered.com/

Right now I'm thinking about the RockStar Collection for $40 is looking pretty good
http://store.steampowered.com/sub/4247/

as well as some of the Indie packs
http://store.steampowered.com/sub/6923/
http://store.steampowered.com/sub/6915/

+1 on Portal. Only $3! Great game

I've been watching the $5 and under games rotate through with much anticipation.