I’m just now starting to kick the tires on upgrading my sub, speakers, and a/v receiver. Unfortunately, I probably won’t purchase everything simultaneously. I’ll probably start either with my A/V receiver or sub. I’d likely start with my A/V receiver but my sub has gone out and so I need a new one more than I need a new A/V receiver, though, if I get a good deal on the receiver, I may start with it anyway. Nonetheless, my room is about 16x18 and is rectangular in shape. Because of the room configuration, my home theater system is centrally placed on the 18’ wall, making my system to face the 16’ direction. My current components include: · TV: Panasonic TC-P58S1 58” plasma · Receiver: Yamaha HTR-5790 · Blue Ray: Panasonic DMP-BD60 · PVR: DirecTV HR22-100 · Game System (used primarily as a media center, not a big game playing household): Xbox 360 · VCR/DVD Rec: Panasonic DMR-EX48V · Main Speakers: Yamaha NS-A1237 · Center Speaker: JBL Studio Series S-Center · Rear Surround: Yamaha NS-A327 · Rear Back: Yamaha NS-AP4400s I’m all but determined to go update to the Pioneer Elite SC-25 or SC-27 as my A/V receiver and have all but decided to go with an SVS Sub. My question is which sub do I need based on my room size and components? Also, and I know this may be out of line, but do you think, until I replace my entire system, I should swap my rear backs and rear surrounds? I'm seeking recommendations on all components mentioned and/or I should consider. Please, however, keep in mind, under no circumstances, will I buy a Samsung product. I likely will not upgrade my TV for quite some time so I'd prefer to focus on everything else. Thanks so much for your help.