I'm glad to see you will be addressing the room acoustics. One thing I would strongly suggest is moving the AV rack and propeller to the corners and placing the speakers next to the TV stand. You might also pull the speakers forward up from the wall a bit. That ought to help with the first order reflections right there.
As for as better speakers, first of all, I would just forget BestBuy. They have a few good speakers there, but you can do better for the money. Next thing is, I would get bookshelf speakers. No sense in spending money on bass extension which you will not end up using.
For $1500 per speaker, you have plenty of good options. If it was me, I would go for some Pi Threes
with upgraded drivers, but I understand the aesthetics of those aren't for everyone. Those are for very powerful dynamics. They will get you a lot closer to a THX Imax type experience much more so than any ordinary tower with 6.5" woofers and a 1" dome tweeter. If you want powerful dynamics but need something more spouse friendly, check out the Klipsch RF-7s or RF-82s. Any of those speakers will desperately want to be paired up with a better sub though, your little infinity sub has no prayer of keeping up with them.
If you don't need to worry about the wife approval factor much and just want a huge upgrade in sound quality, check out the JBL LSR6332
, those would absolutely knock you out. Extremely
high performers for the money, they are used in making THX soundtracks, which very few speakers are certified to do. Again though, they would be crying for a much better subwoofer system. They are $1560 each.
If need a nice looking speaker and don't need commercial cinema dynamics, I would look at KEF. Some R100
s would sound very nice and be well within your budget. Also check out Ascend Sierras with upgraded RAAL tweeters, those are purported to be terrific.
Again, I would urge you to upgrade your subwoofer. You don't know what you are missing with that little Infinity, and trust me, you are missing out on a lot.
By the way, that B17 propeller is sweet.