Stuck in the middle - 50g tank, which Deltec skimmer?

[Rippin]

I think there will be more than a $50 difference between the MCE300 and MCE600, based on what stores in the UK are selling them for. But I'm not too concerned about the price. I'm just wondering if the MCE600 would be overkill for the size of my tank. Also, the bigger the skimmer, the bigger the pump, which means that it will be louder, and I'm trying to keep the noises to a minimum.