Helping Upgrading Graphics Card 8800 Gts 640mb

[cocopuff2u]

Here are the specs to my computer

i7-2600k Processor
8GB PC15000 DDR3 RAM - 1866MHz
Sabertooth P67 Motherboard
Graphics Card 8800 Gts 640mb
800 watt power supply
2 500gb 7200 RPM (Upgrading this to 1tb 64mb 6gb sata)

Im trying to find an upgrade for my Graphics Card, i was looking at the GeForce GTX 560 and/or GeForce GTX 580 SuperClocked (someone locally has them for 350 dollars) i know the GTX 580 is alot better but what would be most bang for my buck? or a graphics card that is even better than what i listed above and just the same price (price range for me is below $400)
I see a little lag on my desktop at the moment but im assuming its the Older hard drives, i was lucky enough to get this graphic card that i have now for free (someone left a computer at the shop for more than 30 days) and now i dont mind spending money to upgraded this card and put this old card in my core 2 duo desktop.

Also if you wanna leave any comments or questions about my computer.

 

[jjb8675309]

lets get one thing straight what is your theoretical system specs? make and model of psu? and monitors resolution? for under 400 id get a gtx 570 for a single 1080p or get a 560ti and oc it to 570 speeds, your choice, either would be sufficient at 1080p, If you like ATI get a 6950..... these will all be good choices, given you have ample PSU and system to run it, look at my sig below...

 

[cocopuff2u]

PSU is
http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=606575&CatId=5441

Monitor is (1680 x1050)
http://www.cedarpc.com/product/3283/Gateway-LP2207-LCD-Monitor/

im not a big fan on OC but yea i like the gtx570 and a decent price

 

[inzone]

The monitor you have dose not support the hihg resolution so it would make no sense to go for a GTX 580. you will be fine with a GTX 560 Ti. This would be a nice card for you ; EVGA 02G-P3-1568-KR GeForce GTX 560 Ti (Fermi) 2GB 256-bit GDDR5 PCI Express 2.0 x16 HDCP Ready SLI Support Video Card. This is a nice card and it come with 2 gb of ram.

http://www.newegg.com/Product/Product.aspx?Item=N82E16814130683

I don't know what your long term plans might be but if you were planning on getting a different monitor that supports higher resolutions then you might co for something like this ; MSI N570GTX Twin Frozr III PE/OC GeForce GTX 570 (Fermi) 1280MB 320-bit GDDR5 PCI Express 2.0 x16 HDCP Ready SLI Support Video Card

http://www.newegg.com/Product/Product.aspx?Item=N82E16814127582

 

[cocopuff2u]

yea i might be getting an High Resolution montior in the coming months, but thanks for the help.i diff might get the gtx570 or gtx560

 

[cocopuff2u]

Best answer selected by cocopuff2u.