About a year ago, I bought the Kenwood HTB-353 which contains the Kenwood VR-405 and some speakers to go with it, they may not be the best speakers but for my needs (Apartment Dweller), they do the job perfectly. I am thinking about changing the receiver for the following reasons: - Now that more and more DVDs have DTS on them, the lack of DTS support on my receiver is starting to annoy me. - I use my PC to do some video capture for Music Videos, some scenes from DVDs I like to cap and send to people and stuff like that. For now, I am using my TV's Monitor-Out (Composite RCA-Jack) to feed the picture from the DVD or Digital-Cable into the PC. I wanna use S-Video, so S-Video Switching would be handy. - 6ch Audio Inputs might be useful to me if DVD Audio gets more popular and that many disks of my kind of music (Female singers/songwriters) gets released, I would go into that and don't want to change my receiver again. And to do some 4-Point Surround tests with my SBLive... - DPL2 sounds like a great improvement for Stereo Music or Movies/TV Shows. To what I can see from Kenwood's web site, the only difference between the 507 and 509 is the Component Switching which I don't think I will need, so far the only device I have that has Component Video is my DVD Player and my TV doesn't have Component In (Currently using S-Video) so I guess it's pretty much useless now. Any other diffs between the 507 and 509 that may justify the 100$(Cdn) Price Diff.? And also the most important thing is, will my current speakers work with it? I know they can only go to 80wpc and the 507/509 are 100wpc receivers, even if I don't crank it to the max (Like I said, I'm an Apartment Dweller) are there any risks that I blow my speakers? And again, with those speakers, will I really tell the diff between AC3 and DTS? I mean, sound clarity-wise, not bass-wise. Considering I can tell the diff between 384k and 448k AC3 and between AC3 and uncompressed PCM. I might upgrade the speakers eventually but for now, they'll do just fine (I hope). I hope someone can help me make a good decision.