I have a soft spot for Toph/Sokka. I really like Suki as a character and I believe that she loves Sokka--probably more than Sokka loves her (because Sokka's kind of immature), so I kind of default ship them. But I love that Toph has a crush on Sokka, and I feel like there's a strong basis there for something in the future, when they're older and if Sokka somehow never married Suki. But of all the characters, it's easiest for me to picture Sokka and Suki getting married and popping out kids, so it's kind of hard to actively ship them with other people.