OK then. Check out my edited in hyperlink in my previous post for an idea of what you are looking at then in that price range. Case is whatever, choose a case you don't think is ugly but it can be cheap. Expensive cases do things like maintain good wiring options, airflow, etc. For a cheap build, who cares. Do you need a new OS license or do you have one you can use?
Also we don't know what type of video card you have. This build doesn't need one but even a low end card might be better than the HD-2500 on Ivy Bridge chips. For some extra money though you could do a Haswell i3 on that budget and be under $500 if you don't also need an OS license. I went with the cheapest good chip.
If you need an OS license and absolutely need to be under $500 then sacrifices need to be made. You could go with a Pentium or Celeron, get a smaller SSD, that sort of thing.