In my experience, balanced He-X v2 trounces SE He-X v2 every single time, especially when using that horrendously underperforming stock He-X v2 cable. On the day I received my He-X v2, I thought the SE cable was adequate until I replaced it with the Sennheiser CH700S, and what a difference! Suffice it to say, I have never gone back to the stock SE cable again, and it has since then been in the box gathering (metaphorical0 dust and cobwebs.
Secondly, the He-1000 is superior to the He-X, in every way conceivable, which is not to say the He-X is bad sounding in anyway... It is not, and i enjoy it very much with certain kinds of songs, but it does really not measure up to the He-1000... Not at all...
Of course your mileage may vary... as far as these individual subjective "mileages" go... I just thought I should throw that in there...