I don't mean to rain on your parade, but the first thing I would do is return the SVS sealed sub and get a sub better suited for home theater. The SB12 is the lowest output sub ever tested on data-bass and rolls off pretty hard in the mid 20's. It's not bad for a music sub for a small room or office. If you really want to stick with SVS, I'd definitely go with one of their ported options, but you'll get better bang for your buck with Hsu and Rythmik among others.
However, if you do want a small sealed sub, I'd look at the JBL550P which is on Black Friday/cyber Monday sale until the end of today. Reg price $599 sale $189. Yes its a 10 inch and is "rated" not quite as low as the SVS but I'd be surprised if it rolled off as fast and didn't perform as good or better. It looks like it has quite a beefy driver. I'm soooo tempted to get this for my workout room.........
For reciever, I really like Denons 3x00 series..it will eat up a good chunk of your budget but you get the highest level of Audysey...XT32, along with subeqHT which is probably one of the best sub eq systems out there. It will set up and eq dual subs.
For speakers, here are a few recommendations that I think will be much better than the choices you listed:
Ascend CBM170 and or Ascend CMT340 for LCR, so 3x CBM170 or 2x CBM170 + the 340 for center, etc.
The best bang for the buck out there currently is possibly the DCM speakers on blowout on eBay. Nice bookshelves for around $85/pair(reg 299 or 349), towers for around $250/pair, and a 7 channel setup with towers for $399 before discount.
Here's a link to the 7 channel setup:
Discount code BFCM2019
for 10% off, free shipping.