okay, so if you're not using a stand alone graphics card, don't even think twice before getting the A8, but if you're going to use a graphics card, then the i3 may be the one to go with. Unless you're planning to get something like a 7660D as a graphics card, in which case you'll be Crossfiring with the APU... In which case, the APU wins again. But if you're getting a graphics card besides the 76XX, then get the i3. If not, the A8 is good.
But, logically, if you're getting something to the level of an i3, I think you won't be going too much further than a 76XX graphics card anyway.
Intel rule for high end... But on a budget... Not so much.