Both receivers are great in this category. But, I'd lean a bit towards the Denon just b/c of the Audyssey correction system which can make a significant difference in your setup. Check my review of the AVR-2308CI as a reference.
That being said the Onkyo TX-SR805 is another top contender that rings in a few hundred cheaper than the Yammie and Denon, has a meatier amp section, included Audyssey but is a bit less sophisticated in video upconversion features and component video bandwidth.
Tough choices
