I would preferably like to spend < ~ $500. Any help?
Most of us end up spending your budget (and sometimes a good bit more) just on peripheral stuff (case cleaners, scales, size gauges, tumblers, caliber conversions, tools, spare parts, etc. etc. ).
Buying used or rethinking single stage might get you closer to your bogey, assuming that you have already got the sturdy bench / well lit work area issues dealt with.