maci has the Quake1 logo on his lower leg. I personally think the shape of the Quake3 logo is better suited for a tattoo, but that is naturally a very personal opinion. Just follow your heart when choosing your tats and you should be fine.
Nice to hear that you actually have a family member that can do your tats, that will surely save you a lot of money, since tats are pretty damn expensive. Be sure to showcase some of your brother's work sometime.