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the builder dual feed system looks interesting - but cheapest assembled printer ?
you're about 800 euros off ! lol
flashforge - 647 euros. Built, tried and tested.
my dutch is a bit rusty (used...

The thing is once you go past .1mm print resolution, you pretty much need a microscope to see the difference.

Ulimakers claim reliable printing down to 0.05mm

But you'd need to see the same...

it's a lot cheaper, is essentially a makerbot that's been upgraded.

If you can afford an ultimaker, then yep get one. Fantastic machines. Thought they were only single nozzle though.
Won't...

the second file would not need supports.

You'll probably find that you start modelling with the bottom up print process in mind.

And as geoff said the flashforge ('makerbot replicator dual'...