Video card advice for my system

I'm trying to decide if I should upgrade my video card or stick with what I have. I currently have the Palit GeForce GTX460 1GB Sonic Platinum Overclock edition. I'm considering upgrading to the Gigabyte GTX 560ti 1 GB Super Overclock card.

My system is: ALienware: Intel Core 2 Extreme CPU 9770 @ 3.20 GHZ Quad core with 4 GB of RAM running Windows 7. PSU = 750

Will I see a decent increase. The price isn't out of my budge to increase but I don't want to bother if it's not going to be worth it.

THanks in advance...I hate making hardware decisions.

I have the Nvidia Nforce 790i Ultra SLI MB...but I'm probably not looking to do SLI. JohnD212

I only have a 750 PSU and I'm not in the budget to upgrade that as well. Would you think two of the Palit GTX 460? I think they take up two slots and Im' not even sure two would fit.

Ok. I'm looking into the 460 sli. I haven't done SLI for many years because I had awful experience when it first came out with most games not working well with it but I can see the 560 wouldn't make much sense.

Thanks

Ok. I'm looking into the 460 sli. I haven't done SLI for many years because I had awful experience when it first came out with most games not working well with it but I can see the 560 wouldn't make much sense.

Thanks

JohnD212