P8Z77-m should OC fine, although I do not see OC as a definite must yet for now.
Next year perhaps, you will want to OC your proc for the new games at that time.
About the OC details, you can search in internet.
Yes, Do the research before doing
You can try to get the OCed version like MSI GTX970 4G, Galax GTX 970 EX OC, etc.