I owned a DTR 7.1 that failed under warranty. It was a b!tch getting Integra to replace it. I had to take it several times to the local repair shop, and ship it twice to the regional repair center. After 4 months, to many emails and phone calls to count, Integra reluctantly replaced it with a DTR 7.4.
In the process of being without a receiver for 4 months, I started looking for a replacement. I did a ton of research, and a lot of listening. In the end I settled on the Yamaha 2500.
When Integra replaced my unit, I put the new unopened unit up for sale on several websites for much less than retail ($700). After a month, with no takers, I decided to keep the unit. It's OK, but I'd much rather have the Yamaha.
One thing I noticed on Integra's site is the 7.6 is 5 pounds lighter than the 7.4 that I have. Receivers normally don't get lighter just because. I'd say the 7.6 power supply isn't as beefy as the 7.4. Even the configuration on the back has changed and it is now much closer to the 6.6. Looks like Onkyo / Integra has made the unit cheaper, while adding HDMI.
Do yourself a favor and get the Yamaha. It wouldn't be product of the year on this site if it wasn't good.