", but for time, since I have a full time job,"
That excuse really doesn't hold up when you consider that many people who have full time time jobs somehow manage to build their own computers. These days it takes all of 30 minutes to maybe an hour (likely less) to put together a computer.
A decent prebuilt that can do what you're looking would be something along the lines of an i5 or Ryzen 5 with 16GB RAM and a mid-range video card ( GTX 1660 or Radeon RX 580/590. I'd for a 500GB SSD boot drive and a 2TB HDD for storage. The thing is that a prebuilt with those specs would probably cost a bit over a grand. If you were to build it yourself you're probably not going hit that $700 price point. If you knocked it down to a four-core i3 or Ryzen 3 and left out the SSD, you could probably come close.
Alternatively you could buy a cheaper Dell or HP desktop, and then add a discrete video card, but that could very well require replacing the stock PSU, and not all mass-market PC's use standard, off-the-shelf PSU's, but rather proprietary PSU's than can't be replaced with something better.So you'll have to do your research.