There's not really a such thing as "best gaming mobo". Every component inside a rig can affect its performance, especially CPU/RAM/Video Card/HDD/Sound Card. As far as mobo goes, just make sure it's from a reputable company that is known to stand behind their products and that the particular mobo you want has received a good number of positive feedbacks. Read up on more threads about mobos and ask more questions, such as people's personal experiences.