Hi. You can get opinions as to how much someone may think the rig is worth, but that would be it, personal opinions. The ultimate end, is how much the buyer would willing to pay for a rig with those specs. The mini tower could be a downside and maybe not. I have an eMachines Mini Tower and fortunately it is well vented with good fans. Otherwise, there could be some major heat issues. I am not real familiar with an APEX PSU. The G.Skill Ram can go both ways. They do put out a good line of memory, but have a budget line that isn't so hot. On the plus side, there seems to be room for further upgrades, including processor. Again, the ultimate determining factor, would be how much the buyer is willing to pay. Best I can offer is to think it through and set a price and be prepared to take less.