I've tried quite a few brands over the years. Had the best time with Gigabyte boards, which I love for their neat features, great layout (very important) and best of all, the backup BIOS, which may well save your bacon at some point.
But, I'm an Intel user, so I have only used Gigabyte's Intel boards. For AMD, the upper-end ASUS boards are usually very well liked, but given that you may be less than keen on them, perhaps Abit is worth a look. That would be my second choice next to Gigabyte.