Thanks Miragez and Joe, for your quick replies.
I have absolutely no doubts that moving to a ciem will be a major improvement in overall sound quality, and I think or at least expect that most custom made's will be an improvement over my IE8's.
Why the custom made IEM's are so appealing to me is that when I'm listening to my music - mostly outside the accomodation of a ship next to the ships funnel, a noisy place - I crank up the volume, to levels that I believe are quite normal. But once I get inside the accomodation and things are a lot more quiet, I only notice how loud I'm playing my music. So as much as I really enjoy good sound quality, isolation is at least as important to me, so that in twenty years or so I still enjoying my music.
It has actually surprised me a little that silicone ciems are known for better isolation. Where I've bought my custom ear plugs not too long ago I had the choice of acrylic or silicon. I opted for the silicone as I wanted to try something new, but when looking at the charts the acrylic plugs were rated with a higher isolation.
Personally I really believe that once good ear impressions are made, acrylic can be as comfortable as silicone. Also when I'm talking to others at work with my acrylic plugs in, I never have noise leakage.(or whatever this is called..)
I'm also not a person that would buy a decent ciem,but already with the plan to upgrade this one later to a better one. Then I would rather buy a better one straight away and enjoy them for a long time.
After reading some of your reviews I've gotten quite interested in the spiral ears, I have sent them an email a few days ago for some info but so far I haven't received any reply yet. I enjoy good detail and if I read your review well, this one performs here admirably. Icing on the cake for me would be the isolation. If I'm not mistaken you have rated this ciem as having the best isolation. For some people custom design is quite important, personally I like the no nonsense looks of the SE5.
Also EM6 has got me very interested from what little I could find. Contacted them and they came back with some info. Ciems are rated 25-28 db isolation.
Whilst I have absolutely no preference where the customs are built, I prefer to buy my iems from some place in the EU so I don't get to pay a hefty import tax on top. German custom's are quite more punctual as the Dutch as I've found out not too long ago...
But if I understand you right Joe, whatever it will be, noise isolation will also greatly improve (with a proper fit of course) over my IE8's right?
Again, thanks for all the help and any suggestions are more then welcome.