You got a good deal even if you just count the speakers you got for that price. The sub and receiver are a bonus. Klipsch speakers are super efficient, so they don't need a lot of power to sound great, so your receiver should be enough. Welcome to the madness!
Your yamaha may be enough. Give it a try. One thing to check: does the Yamaha have preamp out connections on back? If not, you cannot use a separate amp.
I was ready to give it up today a couple of times. I'm glad the Saints never did. Nobody got down or discouraged. They fought back and won the damn thing.
A third KG 4 should be a great matching center, A KG2 might be a decent center between KG4's. Not sure if there is a specific center that would be ideal for this setup.
I saw you were in WI. Here is a link to a single KLF-20 in the Chicago, Il area. For the $250 price, if you have the room, it is an even better match than a KLF-C7.
http://chicago.craigslist.org/wcl/ele/1413851065.html
Check your receiver's owner's manual. You should be able to adjust the level for all speaker sets. You should adjust the surrounds to a level you're comfortable with. I'm sure your center could use a boost to keep up with your rb-35's. Looks like your mains and surrounds are pretty well matched. Some time in the future, you may want to find a center that is better suited to the rest of the system. Welcome to the craziness that is the Klipsch Forum!
If they must be hung, I would go with Heresys (orig, II, or III) They are sealed boxes, so placement will be easier than the others you listed with rear passive radiators. Plus their smaller size will look better hanging.
No they're making weaponized speakers. They are so shrill they will make the enemy's ears bleed. Don't know the name of the projuct, but the speakers are very small cubes or double cubes with a bass module. []
See if you can get both for $800-900. Cash talks. If the Chorus are I's then you wont have trouble placing them as they are front ported like your Corns. I have Forte II's and love them. Never owned or heard Chorus. I don't think there is a wrong choice there, except maybe choosing neither.
133 yards this week, 157 last week. Not stellar, but respectable. Reggie will never be a "running back", but Mike Bell, if he holds on to the ball, and Pierre Thomas could either run for 1000 yards.
I had sold my CR-2a a few years ago and later regretted it. A few months ago, I found a decent looking CR-2 in a thrift store for $10.99. Scooped it up. Works perfectly! This one I will hang on to. Unless I find a Dragon in a thrift store!
I've never had mine professionally calibrated, but my Academy center has sat atop my RPTV for 5 or so years. It is angled slightly downward and sounds great to me. Just my 2 cents. Hope that helps.