This is my daughter's PC, used mostly for gaming, digital artwork, and some light video editing. The GPU is from a previous build - it's a few years old, but still a solid card. All in all, there's really nothing she can't do with this PC, and I hope it'll last her until college.
Phanteks makes great cases, ut small cases are always a challenge to build in. The compartment by the PSU is pretty cramped, since it has a drive bay for two 3.5" drives. If you have drives in both bays, you're going to have a hard time getting the GPU power cables past it. I only used the bottom bay, and made my own, shorter cables for the GPU. The drive bay cage is removable, so if you don't need it you'll have a lot of extra space for cables.
Phanteks cases are known to have limited airflow, something they've addressed on their newer cases. I went with an AIO on the CPU, as I wasn't sure an air cooler would get enough fresh air. The MSI 390 is a pretty large card, which made an AIO necessary for it as well (but this is true for a lot of small cases, not just Phanteks.)
Feel free to PM me with any other questions you may have.