Harmon or yamaha speaker system

HI,
I want to buy Speakers and Av receiver combo , and have shot listed two, was wondering if anyone can tell me as to which one is better.One is Harman/Kardon 5.1 Audio/Video (AVR154HTIB) is around 670 bucks at VISIONS and the other one is Yamaha YHT 6128 HD at around 500 $.If someone can tell me which one is better quality wise then it will be great

thanks

here the links for them

http://www2.visions.ca/Catalogue/Cat...productId=5319

and
http://www.yamaha.ca/av/Hometheatre/YHT6128HD.jsp

there is one more with Pioneer 519 receiver with Polk audio speakers (RM6750) .

here the link for the speakers
http://www.futureshop.ca/catalog/pro...gon=&langid=EN

The Link for the HK is invalid.

I would consider this system, the Energy Take 5.1 http://cgi.ebay.com/Energy-Take-Clas...item3efc0b3c44