Chain/sprocket set (presume is 530?) around $300. I stopped using oil ages back when I discovered the delights of aerosol waxes. The clicking sound is probably a tight spot on the chain, releasing from the front sprocket. Chances are you will need to replace it. Chains/sprockets wear together so always replace the lot together.
As far as what is best...there are differing opinions (of course), but you shouldn't go wrong with a DID HD X-ring chain.
Do you realise how many holes there could be if people would just take the time to take the dirt out of them?
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