755 with pioneer 45TX

I've got a Pioneer 45TX that I use with Dynaudio Audience 72's, 42w's and a 42c. I think I'm "pushing" the Pioneer based on the nominal 4 ohm rating of the speakers. I'm thinking of the 755 for the fronts, surrounds and center channel. I've got a Adire Rava powered sub that works well with this set up. I'm not particularly fussy and a B stock would work fine for me. First, do you think the 755 will meet my needs? I listen 50/50 music and movies. Second, how do I purchase a B stock unit? Thanks in advance!