if you still interested, please state your budget, or what video card you would place in, I mean approximate model like 660 or 7850, something like this, because otherwise we can offer you parts way over your money....
My budget to upgrade this PC is around 500. I'm thinking of getting a new PC in a year or 2 so just need it to last until then. As far as model goes i just need a card that current, fast, reliable and maybe doesn't cause me to buy a new PSU.
Geforce GTX 660ti - 24A and a 450W PSU minimum
Geforce GTX 660 - 24A and a 450W PSU minimum
Geforce GTX 650ti Boost - 24A and a 450W PSU minimum
Geforce GTX 650ti - 20A and a 400W PSU minimum
Geforce GTX 650 - 20A and a 400W PSU minimum
GeForce GTX 560 - 24A and a 450W PSU minimum
GeForce GTX 550 Ti - 24A and a 400W PSU minimum
Pay attention to the wattage in quote, looks suspicious
Radeon HD 7970 - 30A and a 500W psu minimum
Radeon HD 7950 - 25A and a 500W psu minimum
Radeon HD 7870 - 23A and a 500W psu minimum
Radeon HD 7850 - 21A and a 500W psu minimum
Radeon HD 7790 - 21A and a 500W psu minimum
So based on above I am questioning that 7770 actually need 500W minimum
Radeon HD 7770 - 19A and a 500W psu minimum
Radeon HD 7750 - 16A and a 400W psu minimum
Radeon HD 6850 - 25A and a 450W PSU minimum
Radeon HD 6790 - 25A and a 450W PSU minimum
Radeon HD 6770 - 25A and a 450W PSU minimum
Radeon HD 6670 - 17A and a 400W PSU minimum
Check this review and decide, do you want just stick 7770 in (I will check if your PSU can support it) and wait, or you may consider upgrading your PSU and get something more serious?
I have also read when I was doing some research on upgrades that the power supply in my PC is not really a standard one. I was hoping to bypass this by getting a graphics card the would allow me to play current games without overloading like my current one does when I start to play Tera with my current PSU.
I did speak to a dell rep once a year or 2 back and they recommended this PSU E Power ZUMAX ZU-750W to me for a upgrade. If upgrading the PSU will get me better results I am willing to look into changing it.
Also would adding more ram be a good choice for my set up and I'm looking to also replace the chassis fan for something quieter. Thank you for your advice so far.