one is stereo, and the other is a surround. You have to ask yourself what you are going to use it for first. If all you want is listen to music then the Onkyo might be enough.
I purchased some Polk Audio Monitor 40s book shelf speakers and i was wondering if I should get a normal plain receiver like the ONKYO TX-8255 Stereo High Fidelity Receiver(http://www.newegg.com/Product/Product.aspx?Item=N82E16882120128) or get the Sherwood RX-4503 stereo receiver which also has a sub output. Not sure if a extra sub woofer would necessary to compliment speakers of those size.
The Onkyo is also about 20$ more expensive online I dont mind paying extra for it but Im just not sure if its gonna sound better because im shopping online. Does anybody have a good website that compares alot of receivers?
I would also like the receiver to be less then180