Pro Logic vs. Dolby Digital, DTS etc

Nbt makes a good point, but since I have older C39 (not a 39-6) I understand I would lose some front panel functions using MAC3 or MVS-3. Know anything about the MX 132. Gobs of $, but if I unloaded the C39 and the Accuphase T109 Tuner maybe I could spring for the diff if this unit is really worth it. Also, I am east coast - know good MAC outlet who might have a used 132 is this is a good unit?

Swampwalker - The Mac does not have 6 inputs. Would have to buy a processor, where I understand (from Mac) that I will lose a number of front panel functions. Could maybe trade for a C-39-6, but would still need a high quality processor, then one starts to wonder if it isn't better to start with a proper Surround/Preamp, take the one time cost hit and be done with it. We do want high end audio and HT all in one place. Thanks for your input and any other thoughts you might have.