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@Ced
You need the same tooth difference at the front and the back to keep the chain length the same.
the bigger the difference, the bigger the difference...
you could do a 16-46 and 20-42 setup, check sheldon brown's gear calculator. your high gear should be about 70GI (for road) and your path/cyclocross gear should be about 50GI.
If it's for polo, you'd want something at about 30GI.