Hi there, I currently have 4 Paradigm Titans and a CC230. My sub will be a D-box 303 (currently have Utterly crappy sub). I am currently using a Pioneer VSX-D409 which I simply hate. Now, I've heard many people saying that all receivers under 400 $ (US) were the same, but I don't agree. I heard the Yamaha 5440 on the exact same setup (mind you, in a different room but still..) and I was blown away. I have to choose between those 2 receivers (if you have any other better suggestions, go ahead) : 5550 (368 $ CND) : -Cheaper than 5640 (368 $ VS 415 $) -More video inputs (5 VS 4) -S-Video Switching -3 Optical (VS 1) 5640 (415 $): -Has DTS 6.1 and DD EX -Better linear damping (100 VS 80... what does that mean anyways ?) -More programs and DSP (24 VS 21) -Speaker A/B switching So, do you guys think this would be a good investment, and if so, which one is the best buy ? Any other brand I should look into ? I have seen you recommend the Marantz SR5200 over the Yamaha in an other thread. Why exactly ? Sorry if this sounds like a very newbie remark but what's so great about having 6 discreet channels ? (the 5550 has five right ?) Also, I don't really need a lot of inputs/outputs, I am looking for good sound (that's why I find the price differences between lets say 5640 ans 5660 to be ridiculous).Thanks a lot !