Bought Denon 2105 on Spec, Fiber Optics Question

[hershon]

After going to another 2 Stereo Places in LA (Northridge) & hearing Rotell, Pioneer & various Denon receivers, the only one I was impressed with & this may be based on total nonsence as the speakers were all different & God knows what the tone settings and audio settings were, the only one that I liked was the Denon 2105 (I preferred this to the 2805 which may be because of the speaker set up). I used "Norwegian Wood" as my reference. Again, I might have liked the other systems better if I was listening to everything under the same settings & speakers. I decided to take a chance & purchase the Denon 2105 & the Denon 1710 DVD player (the bad thing about this is it doesn't play DVD-A's but I only have about 4 of them anyway & I bought the Denon because the sales person recommended that I was best sticking to the same brand for sound quality), as I basically got $100 off as there was a store sale. I could have gotten the Denon 2105 for I'm guessing another $200 less if I bought it online, but the thing is, the store had a 30 day return policy & given everything I thought that was my best option. Once I get the system set up to my Orb speakers, I'm going to try to do as close of an immediate sound comparison with my JVC DVD receiver as I can. I'm going to hook up my second Orb set that I used in the bedroom to the Denon, so I'll be able to do a faster comparison as I'll have 2 systems hooked up in the exact same location. If I notice a significant improvement, obviously I'm going to keep the set, but if it's not significantly better in terms of sound quality, then I'm going to return everything. I'll report my results once everything is hooked up (it might take me a while to set the Denon up as there are alot of controls).

My biggest question & I definately can use some help here is, I bought a $200 Optilink 3
optic cable as the salesman said that this may affect the sound quaity. He actually recommended I buy the middle $80 model, the $200 one was the best the store carried.
I actually bought both as I figured I could return the $200 one if I don't notice a difference.
What do you recommend. Is the $200 Optlink 3 the way to go or do you know a cheaper brand that I will get as good audio quality? Any comments welcome.