Your system will allow for right/left/center/r right/r left/side right/side left and a subwoofer.
Looks like you are on your way to a pretty nice set up.
Speakers really should be listened to as they have different "flavors" out there. What appeals to one person may not be the sound you prefer.
You also have to concider the room all this is going into. What works great in a dedicated theater may not be the right choice for the open concept family room that is attached to a large kitchen breakfast area.
There are some wonderful speakers out there, that you do not have to break the bank to own, but yes you do need to spend some money here if you want a great sounding system.
I am sure there will be some posts added to this about a few other brands, but here are some that I work with.
You should be able to do a google search for any of these.
All the above have ranges from a few hundred dollars to thousands, some have sub/sat packages, and all are very good speakers.
I am purchasing the Pioneer VSX-82 TXS reciever 7.1 I also own a Mitsubishi WD-65831 : 65" 1080p DLP