Hum...
It looks like there's a cross over point, at 900 L/h, where 1mm baseplate performs better.
It also looks like 4000 L/h is getting close to the point of "diminishing return" (off-hand), where more flow yields little improvement.
Of course 4000 L/h is 1063 gph!
Cathar, are you still of the opinion that higher flow doesn't matter much?
BTW, I found that the Rio 2500HP is pretty cheap, and is available in Australia. It's rated for about 800 gph, with a max head of 10 feet. It's much better than the Eheim 1250 (cheaper too!).
I'd consider using one (or more, in series) of these.
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