Hey Han,
There's a lot of discussion about TD tire choice on some other threads, here's a start:
http://www.bikepacking.net/forum/index.php?topic=1924.0For myself (finished TD'14) I used Maxxis Crossmark 29x2.1 (non-UST) on my Stan's Arch EX rims with Stan's sealant and tape, and I experienced 0 flats and 0 tire changes over the whole race. Seated easily and sealed up well. Rolled pretty fast--I probably could have varied my tire pressure a bit more to make them roll faster on the pavement, but I didn't really bother.
Good luck!
-Nat