I'd scoot the seating just a tad up (like 1ft or less, use a sofa table that fits in the recessed area, so it doesn't look odd), that way the rears will be slightly behind you and you can angle them a bit. Also, having the rears slightly higher would be a little better as well, the tweeters are supposed to be 2ft-3ft above your ear.
As for the fronts, I see the left front is by a door, which stinks, but try spacing them out as much as you can, maybe even slightly toe them out.
Nice setup and speakers though. How are you liking the tv?
> I hope to get something lower with a shelf that will fit the center directly under the TV.
Floating cabinets and wall mounting are always cool, IKEA can be used for that. Here is one on Amazon, Here's a wall mount.