My reason for recommending them was the fact your in a large room. The sub you mentioned from Dayton will do nothing in that room. The HSU IMO is still not the right sub, but your not looking for slam anyway.
The HSU speakers have a horn tweeter, and so do the Klipsch speakers. And yes I think the HSU's will sound better then the Klipsch. Just my opinion. I think there are other options that would sound better then the HSU's if your open to suggestions.
I like the Yamaha receiver better and you wanted something that you could use your I-Pod with. That is why I recommended that.
And if someone else could answer your HDMI question, I would appreciate
that.