I am not sure how resource-intensive PS and Illustrator are. I know for video editing, you need a beast CPU where you can get away with something much more reasonable purely for gaming. For gaming, the most important component is the GPU and you only want enough CPU to not bottleneck it. That usually means an upper mid-range CPU.
Media centers don't require much at all and you can get away with a super cheap machine serving that role. Now that $/terabyte is a complete joke, it's even less cost prohibitive.
Bill Brasky mentioned something about the drivers, but that honestly hasn't been a pain at all since Windows XP came out many years ago.
Stick to PC Part Picker (
https://pcpartpicker.com/) and you can't **** up.
Putting it together is fun and will feel very rewarding when you're done. Getting the most juice out of it by overclocking your CPU and GPU while keeping your system stable is a more advanced, equally as rewarding a step.
I should add, that if you want to get OCD about cable management, it will make the putting-together part a little more time-consuming.
How much are you willing to spend?