It looks good but it seems a bit too low wattage. I did a calculation and I need a 450W minimum.
No you rig is low power low end the CX 430 is plenty it is however a low end PSU like your build in question.
AMD Athlon II X4 645 = 95watt
Radeon HD 6770 = 100watt
mobo,ram,HDD = 60watt
total = 255watts rounded up for safety = 300watts max total system power draw.