Their product line is so big now that it's hard to determine quite where everything fits in.
MTBing is getting a bit ridiculous in this respect! Sssoo many choices and standards for absolutely everything. Just choosing a tyre has become a mammoth task, i just end up buying the same stuff over and again.
For rockshox you've got the following to choose from…
solo air
dual air
dual air u-turn
coil
coil u-turn
then you've got
normal damping(?)
motion control damping
blackbox motion control
mission control
steerers
1 1/8
1 1/2
tapered
+ steel or aluminium for some of those
then you've got to choose a fork model
sid
reba
revelation
tora
recon
sektor
which all have a 120mm option.
oh i forgot the different axles to
QR
15mm
20mm maxle
20mm maxle light