You'll struggle for £70 to find something 'strong'. If it were me I'd be looking at HD7770's though.
My 7850-DC2T didn't have the best of times with games like Bioshock Infinite and DiRT 3 so don't expect a miraculous performance increase from a 7770. Having said that, if you do go much higher your APU will only bottleneck it anyway.
I don't expect ridiculously good graphics, but i can play most games at medium atm so i can atleast get high
I'm not sure what you didn't understand about my last post so I'll leave you to it.
I understood it... don't see what you're really getting at..?