- Look department is very subjective. Some people think case with red-LED sleek, which I would not buy, even if it's dirt cheap and 5/5 star review.
- Number of case fans (front/back/up/side). Looking at your spec, it seems that you don't need lots of case cooling, so it may not be a big deal.
- Fan speed control.
- Noise. How sensitive to noise?
- CPU cooler height. Again, you don't need a massive cooler, so it's a non-issue.
- Expandibility. I think this will be the most critical factor in your set up. How many storage/accessories are you going to add later?
- PSU placement. Do you want to place the PSU facing down on the bottom, up on the bottom, or in rare case, on the top side of the case?
- System placement. Where is this machine to be placed? On the carpet floor, hardwood floor, or top of desk/under the desk