Hey there! As you i was looking for a gaming laptop because of school that is coming up very soon. I did some research and here is what i have found out with these 2 things.
The AMD a-10 is a APU which is AMD's hybrid cpu/gpu solution which from what i have found and tested is not the same quality or speed as a normal CPU. The intel i7 is much better in perfomance and overall easier to overclock.
Now with the GPU;s The 7730m is in the middle of the 640m and the 650m.
So in testing the 650m came out a little on top of the 7730m. I will say tho the 650m's do have better support of you are going to go to linux at any point in time and to me the 650m overall seems the best choose if you are going to do high end gaming like battlefield 3 or something around that. even lower end games will run 60+ easily on this card.
Try to avoid the 670m. it maybe a little more powerful but the power consumption is almost 2x compared to the 650m
I hope this helps!m also i will say the AMD/intel is really just a personal preference. To me, i have seen better performance out of intel over amd no matter what the situation is. AMD is more geared to gaming as intel is more of the over all computing scene from my testing.