Personally If I was to upgrade and wanted to really hear my upgrades money worth, I would spend it on DSP speakers if I had analogue or upgrade my currant DSP speakers should you already own some. Unless you have 7 x 8000's that is.....

If your installation really requires the extra features that the V6 would offer then its an even more worth while upgrade option. I just think you would notice a far bigger difference exploring other options thats all.

Remamber guys the V4 is an incredible piece of kit and will be for years to come.

Dedicated theater room: 30'x15'x9
11-4-4 Atmos System. Trinnov Altitude16, 271, DSP750 LCR, DSP7200.2, sides, 7200SE Rear, 5200.2 front sides, 4 x 320.2 atmosphere, 4 x 24" GSG Subs, 2 x Stereo Integrity 12000 (6000w per sub each with own 30amp circuit)
JVC NZ900+DCR Lens Projector, Kaleidescape system.