Quality time and words of affirmation come out highest for me on this.

Re: the acts of service one, I think living together would be the biggest differentiating factor there. I've only lived with someone once for a short period of time, and in that case I did all the chores because he wasn't living there permanently and I decided it would annoy me less in light of that to just do everything than tell him to and have him not do it to my specification. So while I agree in the abstract re: what you're saying about household chores, myself I've never been in a position to develop a real appreciation for the person cooperating with me, even though I strongly suspect that given time + living together I would.