shaw24 :
I am upgrading so I already have a case (Antec 902) and Antec TP-750 PSU.
You can literally chose any ATX Z170 motherboard with Dual PCI-e x16 lanes and it will be more than adequate for your system.
It really just comes down to personal preference, such as what colours match your theme (if you have one), which one has enough SATA ports, which one has enough USB ports for your needs etc., so its really hard for other people to say.
That said, here are some great choices, cheap at the top, more expensive at the bottom:
- ASRock Z170 Extreme4
- Gigabyte Z170-Gaming K3
- MSI Z170A KRAIT
- Asus Z170-A
- Gigabyte Z170X Gaming 3
- Asus ROG Z170 Maximus VIII Ranger