I need help with my set up, PLEASE

Resolved! Thanks!

You need a DVI cable. Audioquest makes them, as do others. You should use the 6-channel analog output mainly to play DVD-Audio discs. Most DVD-Audio discs (maybe all of them?) have a Dolby 5.1 layer as well as the high resolution DVD-Audio layer. You can only play the Dolby layer if you do not connect the 6 analog outputs from the DVD player to the processor.
Coincidentally, I just posted a pair of Nordost Blue Heaven 2 meter speaker cables for sale. Good cables. I think Nordost is more highly regarded for speaker cable than for interconnects. Signal cable also makes good speaker cables and interconnects.

Cheers.

Tom

Lots of question Carl, but my system is much like yours, having recently got some Ascents, so maybe my response will be of use to you -
1) I don't know your DVD or TV - do they both have DVI and or HDMI inputs/outputs? If yes, there's plenty of appropriate cables around - anyone from BestBuy to your local high-end shop can help you. If one unit is DVI and one HDMI, you can also get cables with such connections on either end. Difference? - HDMI has sound too, DVI doesn't.
If you don't have DVI or HDMI on the DVD and/or TV, then you're out-of-luck. Use component cables.
2)There's no point using the 6 channel cable output on the DVD player to the Sunfire as the Sunfire II doesn't support discrete SACD / DVD-A which is what the 6 outputs are all about. You have to get to the Sunfire III to get the discrete inputs.
3) The CableCompany lets you try different cables to flavor your system as you like. Highly recommended. I have Transparent all around and highly recommend, particularly given your other choices of equipment.
If you have other questions get to me offline.