Oh my god, all of them, all the time, please.
Words - tell me I'm funny and witty and smart and I'm a happy gal. I also like to hear I'm pretty, but I have a hard time believing it so it's a double-edged sword.
Touch - probably my biggest one. I look for some physical chemistry on the first date for sure - let's sit next to each other at the bar and touch each other on the arm or maybe you stroke my leg if things are going really well. I'm also a huge advocate of kissing for the sake of kissing and not for the sake of segueing into something else.
Actions - this is the one that's hardest for me to perceive as a method of showing affection, and of course I tend to get involved with guys for whom this is their primary love language. My ex hated doing all the shopping and errands and crap that I enjoy (or at least don't mind), so he perceived it as a show of affection when he would come along, even if begrudgingly. Of course I appreciate when someone does something nice like unloads the dishwasher or picks me up at the doctor's office, but I have a hard time separating "being a good friend/human" and "showing me affection."
Gifts - Receiving gifts isn't super important to me, but I am an AWESOME gift giver because I remember small details about someone and am very dedicated to hunting down perfect gifts. I remember an ex telling me about how he got into baseball - he really liked this player Barry Larkin for some reason. So for his birthday one year I hunted down an autographed card from Barry Larkin's rookie year, which happened to be his birth year. Of course he broke up with me before I could give it to him, but the thought still counts, right?
Wow this is a lot longer than I expected GUESS I'M FEELING AFFECTIONATE TONIGHT