@Lovelyshawn Before spending any money, take a look at the power supply and its connectors. It's possible the PSU is a proprietary design too, not compatible with standard motherboards. The CPU cooler may or may not be usable, and even if it were theoretically compatible with a newer processor and board, it might not provide sufficient cooling for a newer model. (That depends in part on what new CPU you bought.) The graphics card should be fine, but double-check that too: does it use a supplementary power connector, and if so, how many pins does that connector have? The hard drive is definitely going to be usable in any system.
The idea here is to figure out which components are cross-compatible and therefore how much you'd need to spend on a new build. If nothing but the 1060 and the HDD are salvageable, do you want to build or buy an entirely new, or new to you, system? Or do you want to just get the fastest CPU your current setup would support and hope for the best? Even with a smaller budget, you'd have a lot of options if you were willing to buy from Ebay or the like, but that's your call.
