It is supposed to be like that your system is fine when your playing the game and have a rushed-battle the texture become heavy and kill some of your fps but 70 is enough. Get the better card if you want more fps but those are fine.
Yeah I need a new GPU. I record alot for my youtube channel, and my hdd reduces frames by about I say 40fps, so I need extra horsepower to get 60fps.
What GPU would you suggest for an i5 2320?