Actually I do already have Dolby Digital, 5.1 and DTS 6.1 with 95-95-95 front, 95-95-95 surround and rear surround. From the best I can tell the difference is with the RX-V1400 I'll be getting THX, 110X7, learner remote, detachable power chord, etc... I have also read that the RX-V1400 has a fan... Not sure about my RX-V650.