Well, sure, you could use an HT receiver as a processor. However, it's really a cheap swiss-army knife type of device since they are trying to shove as many different features and functions into a single unit at that low purchase cost. The DAC and audio stages are not going to be as good as the dedicated HT Processors, so if you're not going to use the amp part of the HT Receiver, it would be better to put your money towards an HT Processor. The end result would be that the HT Processor would sound a lot better than any of these HT Receivers.
I don't know any of those receivers personally, but based on the typical sonic signatures of those brands, I would likely choose the Integra.
I don't know any of those receivers personally, but based on the typical sonic signatures of those brands, I would likely choose the Integra.