In your situation I would almost recommend you go with the Yamaha setup you indicated. The receiver is actually an RX-V385 which is an excellent entry level AVR. I would prefer it over the Denon above only because of the speaker binding posts which far more convenient and secure than the push connectors on the Denon.
So you get a good receiver that can take speaker upgrades ratter than a closed system.
the Yamaha sub is a little small but is very good for its price and I've often seen it for under $100 from different vendors from time to time.
the rest of the speakers However are small and undersized for decent HT use and Yamaha is not really known for their speakers, but at least you would have something to start with.
At the price advertised you would be paying for a good receiver and a decent starter sub while they throw in the other speakers for free.
If I were purchasing this setup I would do so with the understanding that I would need replace the speakers at some point to maximize the receiver. Or you may find that you like it and you'r done looking. Since you would have 5.1 setup you could then upgrade one or two speakers at a time and maximize the value, minimize compromise, and reduce the need to save up a huge sum of cash or go into debt to finance a major speaker purchase.