Oh noez, what a hard question
Erm, since I'm a CCS fangirl, and I love Syaoran
and Sakura I'd say Sakura/Syaoran though Kurogane/Fai comes really, REALLY close. I also ship Kurogane/Tomoyo, because I'm an oddball who loves to ship outeragous things
Touya and Yuki is cute as well....too bad they got like 5 seconds cameos *groans*