Worth finding out about the TV if you can, just to make certain you keep it as compatible as possible.
Sub... SB2000 might not handle that room very well, even two of them. For SVS, you might want to consider the PB3000. I would recommend Hsu Research for power and quality at a great price. VTF15Hmk2 would be the main recommendation, but VTF3mk5HP would also work well. In general... buy the best single subwoofer you can allow yourself to afford, and if you switch up to duals at some point, buy one more of the same.
Monoprice Choice for speaker cable, at least 14AWG. Use their subwoofer cable, HDMI, Affinity series for Bananas if you want.
Not familiar with the AVR or speakers myself.
I'll look later when I have a few more to spare.
Best,
R