Anyone have any suggestions based on experience. Should I go A, B, or C.

A) Polk Monitor 40 Fronts, CS2 Center, FXi3 Surrounds ($950)
B) Polk RTi4 Fronts, CSi3 Center, FXi3 Surrounds ($810)
C) Polk RTi6 Fronts, CSi5 Center, FXi5 Surrounds ($1280)

Is the bigger 6.5" woofers in option "C" worth it $$?

Also, how does the RTi series compare to the Monitor in general?

Thanks all!