So many different preferences, of course.
For me, deep, intimate kisses are the biggest turn-on. If she can slowly stroke my cock while doing that I'll be ready to go in no time.
I have enjoyed BJs, but they usually go on too long unless you prompt the girl to move on. Too often, in my experience, the girl takes this to mean you want to put a condom on and start fucking. More often than not I fancy some more snogging!
I also love giving a girl oral, especially if she has a little patch of hair on her pussy. If they are into it, it can really be intense, starting with gentle kisses and flicks of the tongue and building up to sticking your tongue deep into her and licking her ass while she bucks uncontrollably. Good times!