Ask Engadget HD: Which AV receiver has the best upscaling chip?

It's that time of week again, and considering that AVRs have remained strangely absent from our Ask Engadget HD series, Vinesy's question couldn't have arrived at a more opportune time:

"I'm considering the Sony STR-DA5300ES, Denon AVR-3808CI, and the Onkyo TX-NR905, and while I'd bet the Onkyo wins in sound quality, I do favor Sony's user interface. I'm open to suggestions outside of those three, but I'm particularly interested in the quality of the upconverting chip. Is the Reon-HQV or the Faroudja DCDi better? Will they both take the 1080i HDMI signal from my FiOS set-top-box and give me 1080p? Help me legion of nerds. Fanboys: attack me with knowledge and then make fun of me like you do best."

Well, you heard the man! For you receiver freaks out there, here's your shot at bestowing knowledge upon the newbies in the field. But be gentle, will ya?

Got a burning question that you'd love to toss out for Engadget HD (or its readers) to take a look at? Tired of Google's blank stares when you ask for real-world experiences? Hit us up at ask at engadgethd dawt com and keep an eye on this space -- your inquiry could be next.