This pic is actually Elena :P Kat is the one on the bed.

Okay, well I'll break them down couple wise:

Damon/Katherine - Hot hot hot! No depth, no potential, no nothing. They're nice to look at though.

Stefan/Katherine - YES PLEASE! They have the chemistry, the story, the everything and they are damn hot together.

Stefan/Katherine/Damon triangle - This triangle was only interesting in 1864.
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Stefan/Elena - Pretty much the same as Damon/Katherine except they have no chemistry, so they have pretty much nothing going for them.

Damon/Elena - They have it all and more. Hottest couple on TVD, easily

Damon/Elena/Stefan triangle - Hasn't really started yet so can't judge.
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The reason I voted for Damon/Katherine/Stefan was because at least both sides have chemistry with eachother, and the triangle is mildly interesting where as the Damon/Elena/Stefan triangle only has one redeemable point and that's Damon/Elena.

it had to be said

Right on @SpuffyDelena. Exactly how I feel. Sexual attraction only goes so far, and sentimental "I love yous," lose their charm without substance.

SpuffyDelena

I have to agree :D

@SpuffyDelena Nina Dobrev Plays Both Katherine And Elena So How Could one Have Chemistry And The other Not?

:)

yeah thats actually ridiculous to talk about chemistry when the two characters are played by the same actress O_o
it would make more sense to talk about their storyline then
anyways i choose them because Katherine is obviously more fierce , confident and "sexy" ( clothes and behaviour )