Buy The Yamaha!!
I've owned an Integra 7.1 which had several problems and ultimately was replaced by Integra with a 7.4. It was such a pain dealing with Integra (aka Onkyo) to get a replacement, took over 4 months, several trips to the local repair shop, and two trips to the regional repair facility. After all the crap I delt with to get a replacement I vowed never to buy another Integra receiver.
During the time Integra was messing around with my repair / replacement, I went looking for a new receiver. I ultimately settled on the Yamaha 2500. When Integra replaced my unit with the current model, I tried to sell the unopened unit for far less than retail ($700) on several interenet sites. Unfortunately no one wanted it. As a result I still have the Integra 7.4 in my system. I wish I had the Yamaha, and when it comes time to replace the Integra, Yamaha will be at the top of my list.