I want to buy i new graphics card around a budget of £160-180
My PC model is a HP Pavilion p6785uk Desktop PC in depth specs are in the link below

HP Pavilion p6700 Desktop PC series*-* HP Pavilion p6785uk Desktop PC Product Specifications - c02680245 - HP Business Support Center

I am definitely going to upgrade the PSU to a Corsair 600w PSU (link below) so power shouldn't be a issue

Corsair CX 600W V2 ATX2.2 80 PLUSĀ® Power Supply | CMPSU-600CXV2UK

The two cards i have narrowed my search to are the nvidia 560ti 448 edition(link below)

Gainward GeForce GTX 560Ti "448 Edition" 1280MB GDDR5 PCI-Express Graphics Card [4260183362456]

or the normal 560ti (link below)

Gigabyte GeForce GTX 560Ti OC WindForce 2X 1024MB GDDR5 PCI-Express Graphics Card [GV-N560OC-1GI ]

im worried that the 560ti 448 is too big for my case and im wondering of the two which one would you recomend i buy and can you tell me if wither will fit in my case, thanks