the HD7770 of HD7850 for my old pc

hello i want to buy a new video card but have a question ..

I have an old system:
Win7
gigabyte EP 45 DS4
intel Q9450 (quad core)
8gb ram
geforce 8500GT

But i still want to buy a new video card for gaming..

Now im choosing between these 2:

HIS RADEON HD 7770 iCooler € 100
azerty.nl/8-3921-498415/his-radeon-hd-7770.html

Club 3D Radeon HD 7850 1GB royal king € 150 (Bioshock infinite + Tomb + FC3 BD PC voucher)
videokaartshop.nl/product/274895/category-207252-videokaarten/club-3d-radeon-hd-7850-royalking-1gb.html

my main question is, if the 7850 is worth 50 euro extra combined with my system?
(p.s with the 7850 you get far cry 3 and bioshock infinite for free will these run on my system with this card?)

Bless.