I've picked Kirk because I think Uhura should have chosen him (they match together), as about Spock - I think he needs someone ''special'', different...
Of course it's only my point of view.

Pike??? ARE YOU OUT OF YOUR MIND??????

There so cute together & when they kissed OMG!

he's the only one that makes sense because I see her being attracted by the guy with brain, someone whom she can share similar views. Also she studies alien languages and cultures it makes sense that she's attracted by someone who is different. They can work as a couple because they both seem to separate their job from their private life (which is why really in the movie their relationship was showed with subtle moments and mainly one that happened where they were alone) . Kirk is out of question it can't be a surprise that she rejected him over and over. They can become friends though.