You are correct. Your current motherboard does support DDR3 memory. However notice that it uses 800 or 1066mhz but your future ASUS M5A78L-M-LX-PLUS does not support 800mhz. Just check the speeds to be sure.
Regarding the CPU since you mentioned AMD is cheaper I'm assuming you have a tight budget. In that case you will be better with the Phenom
how to check speeds? and actually what speed am i supposed to check?
sorry to so dumb but i'm kinda new to this....
and is there any cpu better than the 965? i heard that the 960t and 1100t are pretty good to.
thanks for the replies, you guys helped a lot!