I always recommend Monoprice for wires and cables:
Monoprice Choice for speaker cable, or Access (iirc) for in-wall
Monoprice Certified Premium HDMI Cables
Monoprice High Quality Subwoofer Cable
If you want Banana Plugs, buy their Affinity Bananas in straight or 90º plugs.
![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
Nothing against Blue Jeans... just their cost is high compared to Monoprice, and none of my Monoprice cables and wires have caused me any difficulty. They conduct electricity well and work great.
AV gear is complicated by nature, and you need to learn how to use it. I concur with my friends above that urge you to learn your Onkyo, RTFM, and you are good to go. Once you learn the basics, you really don't need to worry about anything else unless you choose to become more adept at using the technology to greater effect.
There are better speakers out there than DT, but if you like what you have, no reason to reinvent the wheel. You can do an easy google search on Dolby 5.1 and 7.1 setup and see where to best place your speakers. Doesn't have to be perfect... it seldom is, but get as close as comfortably possible to their recommendations and let room correction do the rest.
Subwoofer is important. SVS, Monoprice Monolith, Hsu, Outlaw, Rythmik... these are all recognized as good brands of ID Subs. Any of these would likely make you a happy sub owner.
![Big Grin :D :D](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)