The Polo would be my pick from the list - with that engine it'll be much quicker and potentially more efficient than the Golf.
I'm unfamiliar with the Ibiza though so can't comment there.
Have you also considered the Ford Fiesta 1.6 diesel? I'm running one at the moment and it's decent to drive. Factory rated at 90hp / 200Nm, however also tuned to 130hp / 300Nm on the same engine with minor fuelling and boost mods.
I'm sure similar things can be done to the VW's but it would depend on what is available locally.
If you are concerned about economy then search the site or users and see what vehicles in that range are getting the best results.
Cheers!
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