Inversion after "than"/"as"

Solution 1:

(A) My system is no more expensive than yours would be.

(B) My system is no more expensive than would be yours.

(C) My system is no more expensive than would yours be.

Version #A is a sorta default kinda version. Version #B might be preferable when the speaker wants to put a contrastive subject in end position. Version #C is ungrammatical: ". . . the subject follows the sequence would be: it cannot invert with would alone, . . ." (CGEL, page 1107).

Inversion in the comparative clause can occur under certain conditions. This topic is discussed in the 2002 reference grammar by Huddleston and Pullum et al., The Cambridge Grammar of the English Language (CGEL), page 1107.