Best power supply for an i5 2500k and MSI Geforce GTX 970?

haroldj97

Honorable
Jun 9, 2013
160
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10,680
I am planning on rebuilding my desktop that I upgraded from earlier this, an i5 2500k, MSI Z68-G43, 8GB DDR3 and a MSI Geforce GTX 970, as a secondary system for friends to use. Since I moved the power supply into my current desktop, I am looking for another. I don't really want to spend much since it won't be used regularly or overclocked but would like it to be reliable, preferably around £40 ish mark. Not sure what wattage will be needed but thinking around the 500W mark. Found these so far:

EVGA 500W 80 Plus

Cooler Master Watt Lite 500W

Are they any good or could I get away with a lower wattage power supply?