Gigabyte still has the same old problems they always did. I've read of people thrilled with their P35 Gigabyte purchases only to come back a month later with complaints.
Anyway, that's besides the point. No real need to get drivers from Gigabyte. I'd go with the chipset manufacturer drivers, such as directly from Intel, etc. I didn't go to Abit for my drivers at all. I got from Broadcom, Intel and Realtek directly.
Sure they are..., especially if its not an old one.
Check the chosen distro site, search for your board's model and/or chipsets.
The best distro for you depends on what are you gonna use your OS/PC for...
If you are a professional looking to train yourself on Linux for a production environment etc, get Debian, Centos, Suse.
Or even you may want to try with BSD (non linux, still unix like systems)..., FreeBSD or OpenBSD the best choices.
If you are not a pro and just want to mess around get Ubuntu or Fedora.
Yeah they are and the best bet would be to get your drivers from the disc that came with the freaking motherboard. Or just directly like others have said. And with the other guy, i'd go with BSD rather than Ubuntu or other linux. They really are better, very stable. And the gui is awesome.