Ur MoBo choice is already good. no need to change or downgrade it. My personal preference is always ASUS then any other brand.
UPS: Cyberpower 1350 - 810 Watts/1350 VA, it packs 8 outlets (4 battery+surge, 4 surge), and is well designed for home theater setups, computer workstations, and it's slim enough to fit behind or under a desk. It also features USB and Serial connectivity, protection for Ethernet, coax, and telephone lines. The included software will shut your devices down gracefully in case of an outage.