I've thought about going the "receiver with USB DAC" route rather than "compact amp with USB DAC", which is what I'm now finding myself in need of replacing.

The issue with a receiver is size. I just don't want one of those monsters on my desk, when all it's doing is driving my computer speakers (a pair of 2-way Paradigm bookshelf speakers). That said, the receiver I've had my eye on for a while is the Marantz NR1604, which uses class-D amps and is far more compact than the usual receiver. It's also a bit pricier than something like the Teac, which is at the high end of what I'd be willing to spend. Although the Marantz doesn't have it, a number of other fancy receivers these days do include USB DAC support.

That said, the idea of using a receiver as a computer video switcher is pretty clever, and getting audio out of a computer via HDMI is a clever idea.

EDIT: Accessories4Less seems to be offering the Teac box for a solid $100 off list. Some modest digging through AVSforum indicates that they're not a fly-by-night operation, so I've decided to go for that.