Fortunately your Aurora R9 PSU is ATX format, so easy to find a replacement and a very simple installation process. You should consider a fully modular PSU that is no more than 150mm long. What wattage PSU were you considering?

Thanks for the response! I am open to the wattage, as long as it is compatible with the rest of my components. I initially wanted to get the 850W model, but Best Buy was out of stock. I was in a pinch and didn't have time to have one delivered.

I have a RTX 2070 and NVIDIA recommends a minimum of 650W. I know my options are limited, but eventually I would like to upgrade - which may translate to more wattage (?). 

I've found a couple of threads posted by other users about replacing PSU in an R9 and, from what I gather, the electrical specs are very particular and it can be challenging to find compatible replacements.

Again, your Aurora R9 PSU is standard ATX format and the replacement process is very simple . . . just need to take your time and think it through. This is a list of fully modular ATX PSUs between 750 watts and 1000 watts and between 140mm and 150mm long pcpartpicker As you can see there are many choices.