Which parts should I upgrade in my PC for a $1,000–$1,200 budget?

Because you’re not experiencing a particular problem, there’s no urgent reason to replace the whole machine just to make it feel newer. With a $1,000–$1,200 budget, I’d first decide on the target resolution and refresh rate, then choose a balanced CPU-and-GPU combination rather than spending heavily on storage or memory. Your 32GB of RAM, SSDs, cooler, and 750W power supply may be reusable, assuming they’re in good condition and compatible with the new platform.

There isn’t much benefit in upgrading only one major component without considering the other. For 1080p gaming, a CPU or platform upgrade may help more, while at 1440p the GTX 1070 is likely to be the main limitation. If you want the largest immediate gaming improvement, put most of the budget toward the graphics card and upgrade the CPU and motherboard together if necessary. Since the current system still works, waiting another year or two is also completely reasonable.

Before choosing parts, double-check the specification list: an i7-8700K uses an Intel motherboard socket, while the ASUS X370-F is an AMD AM4 board, so those two parts cannot be used together. If the CPU information is correct, you would need a compatible Intel motherboard for a CPU upgrade. If the motherboard is correct, then the processor must be an AM4 Ryzen model. The exact recommendation also depends on whether you play at 1080p or 1440p and what games you run.