....is probably the HTZ510. It's below $500 on some websites. It has 5.1 surround sound, 1080p Upconversion, HDMI Output, Wireless rear speakers and it connects very easily to your TV with Samsung's Anynet system. If you don't know what Anynet is about, you can go to - http://www.samsung.com/us/consumer/learningresources/anynet/index.html
Hope this helps.
I am renovating my living room and want to update everything, I have decided on the PN50A550. I was interested in opinions on what surround sound system would be best with this TV in a room that is 16x20. I will be also be running a xbox 360 with the system. I would like to spend less than $500 on the system. So i would appreciate any ideas or opinions.