Total real, peak power consumption of those parts will be under 200W. Any average quality 350W PSU would handle that, but a poor quality generic 450W might not for very long. There is no need at all to pay more for a 500W+ PSU for those parts, but if you ever planned to upgrade to higher wattage parts, it would give you breathing room for that, and often the price difference between a decent 450W and 500W+ PSU isn't much if/when you find a sale for the best price.