i7Baby :
You need 19A and 500W minimum. You should get soemthing that Seasonic make - either their own brand, any XFX PSU or some Corsair and Antec PSUs eg Antec HCG 520M
500W minimum...No way!
The FX 6300 has a 95W TDP
The 7770 has a 80W TDP
With other components, that'll come under 275W easily, 500W minimum is not a minimum, though you always want Watt headroom, which 450W has that.
With corsair PSU's, you'll be sure to find that a VS has above 19A.
You are set for the upgrade, having the requirements and headroom for the build with the VS 450 by corsair.