Pardon my frank and upfront comment; but shouldn't you have chosen your speakers 1st then build around it? I.e. get a receiver next?
I am not a real fan of Klipsh so I guess my vote is for Energy if you certainly must limit yourself to the above choices. Your receiver should be able to handle them...
Let's not beat up on a 2 post person. We all make mistakes. And it's ok he only spent 200 on a receiver.
Not like it's a crazy loss.
I suggest you not try to build a 5.1 system with that budget. But I think you can get a set of Primuses and a decent sub for a nice price.
Would you have more fun buying 2 very awesome speakers or 5.1 budget speakers.
Think about this.
You can get some really awesome towers or bookshelves with 700 bucks.
Seriously think about this.
You can have a hifi system built over a period of time. You can get 2 speakers that will last you a long time.
Ok now i've given that.
If you still want a nice budget system. I suggest looking at the SVS stuff. 1. They have a great reputation, good build quality and good sound. For me a speaker needs too look as good as a it sounds. I think SVS speakers look good and make a nice system
Now if you want to go this route you have 2 ways of going
You can build from the bottom up. With a nice sub and cheap speakers or from the top down. With great speakers and a cheap sub.
I would do the latter if you are in an apartment or have a small room. If you have a large room you shouldn't buy a 5.1 setup on your budget. It would be a waste of money.
With that said I suggest you get SVS's set of 5 speakers
http://www.svsound.com/products-spks-sbs01.cfm
Why?
I think it's a very good bet for SQ on a budget, and I think they are well built speakers with great versatility. Since this may be your first awesome system I expect you will find yourself listening to music far more than previously. I didn't use to listen to music on the old Sony HTIB, but on my speakers now. I listen all the time.
Then add one of these.
http://store.audioholics.com/product/1974/0/dayton-sub-120-12--150-watt-powered-subwoofer
If you need more budget you can get the 10inch as well.
The above recommendation assumes you have no SO living with you or she is open to large surrounds(you could also prefer smaller surrounds for your room). If this is not the case. Then I suggest a pair of KEF iQ3s for the fronts paired with an iQ2 and a pair of iQ8s or KEF 2001.2s paired with this sub for maximum WAF.
www.accessories4less.com has by far the best deals on KEF speakers and receivers(though you got one already) You can pick up the cables there too. Or use monoprice.com
Hope this helps.