Since the Denon was raised as one possible alternative, it could be the better choice for you as it has a feature called 'Dynamic Volume' which helps improve the "fullness" of sound when playing music or movies at less than reference/high volumes. Across the board, owners seem to really appreciate it and it's a feature that has real practical significance.
On the other hand, Pioneer 2009 models such as the 919 have probably the most functionally competent Ipod integration, that's if you have an Ipod and you ever want to be able to play it through the receiver.
Also, both the Denon and PIoneer have a feature which levels out the sound going from loud commercials to quieter programming. My general impression, albeit a somewhat vague one, has been that the Denon's is better but I can't say for sure.
The Denon and Pioneer brands have roughly equivalent solid reputations for reliability, so you can't really favor one or the other from that standpoint.
There are certainly other considerations which might sway you in one direction or another, even another brand altogether with their respective receivers at a similar price point. Based upon your stated usage needs, which are pretty basic (i.e., "I will mainly be watching TV, Bluray, Gaming"), I'm sure many different receivers would work well for your situation. The vsx-919 would certainly qualify as one of several fine choices.
Personally, I would tend to favor the Pioneer because it has some additional sound tweaking potential with it's MCACC EQ software, which can be overridden manually to a great extent than, for example, Denon's Audyssey EQ software. But if you have no interest in playing around with this type of built-in EQ software beyond the automated option that both brands have, then my preference should have no bearing upon your decision.