Should I buy a receiver or processor?
First things first. Do you need such an amp in the first place. What speakers are you using that requires such a monster amp? How big is the room that requires so much power? If your speakers are 8 ohm/93dB sensitive, a high end receiver is quite capable unless your demands are excessive.
Second, if you are set upon getting the amp in any case, it serves no purpose to look at receivers in the $1500+ range where the Integra currently sits unless you find a specific feature in a receiver that the Integra doesn't have. That price point may be lowered a great deal in the near future as Emotiva and Outlaw introduce their new pre/pros.
I used to use a receiver as a pre/pro, but for some reason it bothered me always having the amp section of the receiver on and drawing power but sitting idle all the time. I already had the amp because my speakers are low impedance/low sensitivity. So when the time came for an upgrade, I was looking at receivers that could handle my speaker's demands without the Rotel or a processor with which to use the Rotel without wasting a whole amp section. The price point of receivers with the features I wanted made it a no-brainer to choose the processor.
The budget receiver + amp makes sense for many even though the same money spent on a high end receiver might have been a better choice given the speakers in question and there certainly is a place for dedicated separates. Give it some thought and compare all the available options before making a decision. Choose what's right for you.