a used Raidmax 530W PSU is definitely worth less then $40, more like $20.
a used P35 mobo is also worth a lot less then what you said, more like $50.
a used E6300 is almost worthless nowadays. 2.5Ghz 45nm Pentium DC's sell for $50 nowadays. that E6300 might be worth $40, but since it's been overclocked, more like $25.
The DDR2 isn't worth that either, moer like $40.
a used overclocked 9600GT is definitely not worth $90 by any stretch. More like $50.
I mean, you can try selling the system for $850, but any sensible person will pay the same for a new Core i5 machine.
My advice is to pull out the 3 1TB HDD's and sell them separate, and then sell the rest of the system for some $500.