I currently have this pos motherboard: ASUSTeK P8H61-M LX2 with my i5 2500k. This motherboard cannot handle overclocking and is by far the weakest component in my computer.
They still sell Z77 MOBO? You won’t see much a performance gain regardless. The hyper 212 is a good cooler to start off with and alright for small OC. Luckily you are on one of the last CPU that used solder TIM instead of thermal compound so you could easily OC 4.5+. If you look around at hardforum you may find a z68/77 for $80 or so.
You won’t really get any performance jump from changing mobo. You are on a socket that is now 4 years old and no longer being used. I would save my money and jump to 1151 when you get enough for a new CPU and mobo. 1151 brought DDR4 ram also so you would need new ram.