You're getting confused. Rockshox has two lines of Tora shocks: 1 for trail, and one cross country. The trail forks are the 289, 302 and 318. The 318 comes in either air or coil. This one from
JensonUSA is $250, has U-Turn adjustable travel, and Motion Control damping. The reason that there are sometimes multiple weights, is because the forks have different options, like dual air, solo air, or coil.