That would depend mostly on whether you want 4 speaker. Note that the speakers on the ACS54 are the same as thoser on the low end 3 piece system, the ACS33. I have the ATP3 and love it. In my opinion if you care that much about surround, get dolby 5.1 with Klipsch speakers, or get the ATP5, which is gonna use the same speakers as the ATP3. They are great speakers, and attractive too! The sub is powerful too. I use a SBLive value, which might limit quality, but overall I think it sounds magnifique. I would not get the ACS54 if you want high quality music, my friend has the 3 piece version and they dont sound nearly as good as mine, and he has a santa cruz!