Get a GTX 970 then and the power supply you will probably need to power it.
/e
http://pcpartpicker.com/p/LY6pMp ...changed PSU.
Then when you have another $400 - $500, replace motherboard, CPU and RAM.
The reason: The reason you can't do all the things you want is that the G3258, is a dual core processor. The obvious upgrade would be the CPU, motherboard and RAM, BUT the 8400GS will then be a severe bottle neck.
So, in these cases I always do the vid card and PSU, at one shot, then the mobo, CPU and RAM at another shot. The timing is great for this...cause the DDR4 Ram, CPU's and mobo's are coming out, now...so in about 6-8 months the DDR3 mobo's CPU's and RAM will be a lot cheaper.
This post was edited by Ghot on Feb 9 2015 11:25am