m&k speakers opinion

hi all, i have a set of s 125's for my front L/R and center.

i've been thinking of upgrading to s150thx or s100b for the 3 front channels.
i dont use thx processing when watching movies.
i use my system mostly for movies.
my room is 14x12 with an 8 foot ceiling.
due to my room size:

will i benefit from a s100b upgrade?
will the s150thx be better even tho i dont use thx processing?

thanks