I'm upgrading my home theater and I'm getting new speakers for my digital Panasonic XR-70 Receiver. I'm trying to decide on the following 5.1 systems...Polk RM6800, Infinity TSS-750 or the Definitive Technology ProCinema80. The weird thing about the Definitive set is that it has the 100 center and 80 sats (normal) but only comes with the ProSub 60. Is that ok? Thoughts? Something else I should consider?