Gaming computer primarily, nothing else beyond word processing and internet.
Below is the meat, not sure which way to go with Motherboard selection or a Heat Sink for the CPU (not doing liquid cooling route). Any advice appreciated.
We usually recommend using the P55 chipset with icpus that don't have integrated graphics, and normally recommend Asus or Gigabyte for consistent performance. Since you selected a microATX board, here's the equivalent: