812 TPC is a cheaper option with similar performance to the NH-D14, 612 PWM is a cheaper option
The 212 EVO is a great budget option too
Will they be enough if I decided to overclock? If I can improve on performance for cheaper, I'm all ears, but I want to make sure it will be plenty cool for extended rendering/gaming sessions. I have around $100 to spend on a CPU cooler, so I can afford a pretty good amount.