Truly I'm amazed ultimaker is charging so much for the V2, when others with even more machining done are charging less (see: arcol.hu hot end; four machined parts in all metal and theirs comes with a heater resistor and thermistor).
I think the metal hot end is the way forward! Although again nobody has done any research or calculations on what is the best hot zone length and orifice length to optimize retraction at high speeds. There's been lots done on the hobbed bolt side, but nothing on the hot end. Why?
It's also possible that these numbers are different for different materials. Maybe (now this may be really pie in the sky) a hot end with an adjustable hot zone would be good? Maybe you could move the location of the fan along the heater barrel to determine where the hot zone ends? This might not be needed or practical but it's what comes to mind . Could be a good setup for research purposes too...
Keep up the good work, alaris2! Let us know how it goes! Meanwhile I am upgrading my bowden tube setup once again..
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You're wondering if anyone is interested in more pictures and info? What a silly question!
Of course we want more info and pics 
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