When it comes to music systems I hate complicating things with an AVR and all of the video circuitry, extra buttons, ect ect. I know they have direct mode and can isolate things but I would rather have a simple dac and amplifier set...
Here is what I would do, scrap the sb1000 for an outlet sb112 nsd {I have heard both and own 2 of the sb12's, they are awesome}, for $529 its only $30 more than the 10' sub and has high pass outputs, so it will control your crossing for you, 2 problems solved 1 having a 10" sub and 2 crossing to your mains...
Next grab a nice 2 channel amplifier like the UPA 200
https://emotiva.com/products/amplifiers/upa-200 {you can get bstock if you call them and order ofver the phone and save a good amount}...
Now for a dac, you can go with an emotiva xda2 {also available in bstock} or something less expensive like the Audioengine d1....
So you will have a nice direct path, with volume control and integrated crossing to your mains....
I know some guys would rather throw a home theater receiver in there and call it a day, but this is for your formal music listening system, separate components adds a little class, and keep in mind resale value will be towards 90% vs an avr is hard to give away after 5 years.... You may never hear the difference between an HT receiver and the most expensive pre/amp setup in the world, just like you may never hear the difference between hooking up a car stereo headunit with a 12v power supply and a HT receiver but stuff belongs where it belongs, to me an HT receiver belongs in a room with a tv and playing movies, just like a car stereo belongs in a car, "music only" is just that, why confuse it with a bunch of stuff that has no use...
Good luck..
PS- a quick wiring run down for you incase it is confusing....
Your optical out will go into the dac's opt port, then the dac's analog outs will run to the sub, the subs high pass outs will run to your amp and your amps speaker leads will go to your speakers...