Hi again!
As an update to this:
I ended up getting the Westone 2 and here a bit about my recent experience: (Also posted in ljokerl's IEM review thread)
For all of you who think about - or might one day think about - getting the Westone 2: I got a pair as a gift in April 2011 and immediately liked their imho clean sound and loved their very sturdy fit, something not all non-customized IEMs have.
However, after a few months they got damaged and thanks to Westones one-time-exchange-without-any-questions policy I got a new pair. Now, after approx. 22 months of daily and intensive usage, the jack starts to have a loose contact, causing dropouts every now and then. As always in the beginning of such problems, it now only occurs during movement, e.g. while riding a bike. But soon, they will be pretty useless.
Sad, cause I really liked them and hoped and expected them to be a bit more resistant, given their design and all. I already contacted Westone and they will give me an offer for a discounted exchange pair or upgrade for other Westone products.
As always, ljokerl's thread is my trusted place to see what I might choose, exchange or upgrade.
Best regards,
Manuel