How much power for an i5 4670k, a NZXT Sentry 2, an LG DVD reader, a MSI R9 270X, 3 Corsair fans that come with cases, 4 SP120 fans, 2 sticks of 4 GB RAM, a Kingston V300 120 GB, a WD Green 2000 GB? I know that a Kingston v300 Series sucks. Would 750 watts work?