Hi, get the Athlon II X3 435 for this reasons:
1- The Phenom X3 8750 is a old processor, so, is AM2+ and 65nm processor.
2- The Phenom X3 8750 is a 2.4GHz processor, the Athlon II X3 435 is a 2.9GHz processor, that with OC can get 3.5GHz or more
3- The Athlon II X3 435 is a 45nm processor, 95W processor and AM3 socket.
4- The Athlon II X3 435 is only $1,00 more expensive that the 8750.