Will any of the Black Friday desktops work as a starting point for an HTPC? I'm looking for something that can run the HD Home Run Prime and has Windows 7.
Plenty of i3 desktops out there using intel integrated graphics. You'll still have to do some tweeking and add some software/applications for HD audio over HDMI but doable. These desktops aren't really about the quiet though so be prepared to change some fans. There's a Gateway i3 with BD driver refurbished at Tiger Direct.
Specs like i3-2120, 8GB RAM, etc sound promising, but the motherboard hobbles it. H61 chipset, instead of H67 or Z68. No HDMI output. No Toslink/optical audio out. By the time you add in a video card, you're probably spending more than if you'd built yourself (even factoring in the cost of the OS).