thanks for all the advise.

Alex; Yes, I am from the Netherlands (EU) too so a European dealer would indeed solve the customs problem.

So highflyingclive, is that being from EU the reason why you advise to first choose the dealer. Otherwise I can not understand why first select a dealer. As they are all 'screened' in the community they should all be rather trustworthy. What could the difference be between one dealer and another except his stock?

And as MrRadioActive said; "I'd suggest reading and comparing the product threads on both dealers".
That is exactly where I am looking for. But having read a lot of reviews, not all of them say; well I bought this watch from that dealer and these are my findings.
http://www.repgeek.com/showthread.php?t=2548
Found this thread from a member also seeking for a UPO and wondering where to buy. The thread is not that conclusive in difference of quality.
Did anyone review say PO from Silix vs UPO from another dealer?

So hope you can push this thread a little further to the core of the case.