I don't know about Matt and Kara dancing together (although I don't have any objection to it) but I would love to see some of the celebrities dance with some of the other pros.
If Matt, Kara, Scott and Ann were left I'd love it if:
Matt; danced ballroom with an elegantly dressed Natalie because I've always though they'd be a good match and that Aliona was a bit too full on for him.
Scott; assuming that he's got his energy back he and Aliona could probably do a pretty good latin, and I bet she'd get those hips moving.
Kara; could to a beautiful ballroom dance with a surely deserving and probably suitably grateful Anton.
.
Which leaves my favorite combination
Ann: do latin with a preferably shirtless (because we know how much she hates it) Artem, And what's more I'd make it compulsory that she did it or she'd not be in the competition.