Tiago Marques mentioned the Gigabyte GA-MA78GM-UD2H (rev. 1.0) as a possible coreboot target. Although I'd love to see coreboot support for my board I don't know if it is a very good candidate, since I can't find it for sale anymore (at least in Germany).
Anyway, here is the output of flashrom, dmidecode, superiotool and lspci.
Greetings Sebastian