Hello everyone!
I posted this in the main forum but, after a lot of searching, I have decided to go with Monoprice for all 7 speakers.
Now, I just need some advice on which ones.
My house came pre-wired with everything on the ceiling but the front and rear are vaulted although the angle does actually help the speakers point towards the couch.
The room is loft style and is 14' x 18'.
The front and rear walls go 8' before they angle in. The top is at 13'.
It is prewired with 7.x although the side speakers were not installed slightly behind the seating area. They were centered. As the builder had the security system guys do the prewire, you get what you pay for.
Also, this room is only for HT. Music will most likely be limited to Rock Band with the kids.
I just bought the Onkyo 818 and will be getting the Epik Legend to fill out the lows.
This thread has opened my eyes to all the possibilities but I think I have it narrowed down (maybe) to one of the following options:
A - 7604s all around (It really stuck with me about voice coming through a 5.25" speaker but, with the Onkyo pumping out 135W/ch at 8 ohms and ~180W/ch at 6 ohms, I want to have the headroom)
B - 6816s all around (Gotta love the size and power in these)
C - 7604s up front (LCR) and 6816s for the surrounds (I keep the strong voice speakers up front and get power everywhere else)
D - Some other combo (Maybe, the sides are a little too high for either of these. Maybe, I should pick something else)
I am attaching some pics and probable locations with notes.

NOTE: It may be possible to place the center on the flat wall and move the L/R down to the flat as well although this may prove difficult.
Behind these outlets is the open attic and it will be impossible to box in the speakers.
The HDMI and power will be ran through the walls.

NOTE: Where the outlet cover is, there is the ceiling joist so I cannot cut into the wall at that location (plus it is centered).
I plan on moving the speaker slightly higher and further back in the room to place the speaker slightly behind me.
By doing this, the bottom of the speaker will be at the same height as my new ceiling fan.

NOTE: The speaker on this wall will match the other and the light becomes the ceiling fan.
With all of this, how do you think that I should proceed?