It sounds like that dealer is trying to rip you off on the cables... but wait, there's more, I'll throw in this bottle of snake oil and some oxyclean, two for the price of three.
I doubt you were seeing the full potential of your N804's with a 75w rec; more like a rough draft copy.
Surround speakers are next to useless, I find they are only good for horror movies if you need to be scared from behind... else forget about it.
I can't stand the music on the radio these days (tuner not needed)... what is that stuff anyway it is like computer generated pop-rap with a bad beat, static injected into the background just to make it louder and a 3 word lyric repeated for 4mins... what is the latest one floating around these days "War remix" of "Until I Stay".
I listen to a LOT of music, ~3068hrs per year. Since I spend so much time listening I am very picky about my audio quality; but on the same note, I'm not going to sell body parts to line the pockets of some dealer/OEM, just to obtain the last 5% either.
The new 804S even when powered with highend Classe gear was not to my liking; the N803 is a better speaker IMHO, a tough call with some hair-splitting involved for sure... I would hazzard a guess that the 804 was maximized to near its full potential.
I have N803's bi-amped with four channels of 120watts from a RMB-1075, its still not enough power... it needs twice that IMO. Even with this modest amp/system, it is clear that the N803's has smoother bass with more headroom and a cleaner mid/treble range in comparison (better crossovers and cabinet space I guess).
The 804S has tighter bass but it and its tweeter is not smooth to me though, its "in your face". I believe the Classe was clearly providing it a wider, more transparent soundstage for it than my rotel; providing more current than those drivers could handle IMO... it sounded like the the little engine that could "I-think-I-can". Maybe is was damaged previously before I demo'ed it?
Maybe the N804 doesn't suffer this, but if it does, then you'd be better off to just selling it, scrap the $1000+ in wires and get a N803 or better.
I don't know what your goal is, but my overall goal is to make the best system I can for the lowest possible price. I want something that's not fatiguing, something that is effortless in everyway and has that "sound"... you know the kind, when you walk into the room and go... "yes that is IT!"
My Yamaha RX-V2500 is the weakest link in my system right now, hence the RSP-1068; I'll see how that pans out over the week or so. The yam is a fatigue generating machine; its not obvious at first but I has finally gotten to me after a year... even in its pure-direct mode it is not enough, It is preventing the "sound" for sure. I'm gonna take it skydiving soon
This is what I currently have:
B&W N803 $2300CAD Used
Rotel RSP-1068 $686CAD Used (Just bought today)
Rotel RMB-1075 $700CAD Used
Velodyne CHT-15 $700CAD Used
Velodyne HGS-10 $650CAD Used
BFD $130 CAD Used
6 Athena AS-F1 $400CAD x 3 New
Yamaha RX-V2500 $250 Used
Wire + interconnect $200CAD x 7 New
Creative X-FI $150CAD New
Total $8166CAD excluding shipping and tax
+
HT/Gaming PC $3070 New (no tax, local purchase)
Grand Total ~12-13k CAD taxed and shipped (est)
You can view it all here, keep in mind the mono-audio, microphone distortions are quite high and youtube re-conversions doesn't help any, it sounds and looks much better in person:
http://www.youtube.com/profile_videos?p=r&user=BassThatHz&page=1
This is my current wish list:
Buy Two RB-1092 or RB-1080 one per N803 ($1-4k used)
Make Two DIY subs: CSS SDX-15 + 1300watt plate amp ($700CAD each)
Sell the CHT-15, RX-V2500 and 4 of the AS-F1's
Buy 1080P Project + HD Player ($2k new)
Buy PS Audio Premier Power Plant ($1100 used)
Perhaps you can learn from my Journey.