If you're mostly using the towers for music with a little HT use then I wonder how much benefit getting the upgraded DSP for the center would give you. While looking at upgrading my VP150 to the VP180 I also don't see much benefit to getting the high powered versions for the center. It's mostly used for dialog in movies, so having the upgraded woofers that can handle higher volume without distortion & compression seems unnecessary unless you're HT listening area is really huge and is seating many people.

M60|VP150|2xQS8|PSA XS30+Epik Empire|Pioneer Kuro 6010FD|PS3|Denon AVR-X4000|Parasound 5250v.2|