What is your price range and are you opposed to buying from elsewhere in Europe? With your list of headphones and since I have not heard any ACS and only Westone universals I am not so sure you would like the ES3X/UM3X, however the ES5 is getting rave reviews and I am sure the T series is pretty good. I would actually think the Minerva Mi-3 would be a fairly good match for you with your list headphones or possibly the Fabs or even the SA-12. You have to think of buying a custom IEM as a long term purchase so looking at all your options is the way to go and buying based off your preferred sound sig is ideal IMO.
Also, if you are seriously considering the ES3X, buy the UM3X first and see what you think of the sound signature. If you like it then you can decide if you want custom sleeves or to go full custom. In my experience, custom sleeves do usually improve the sound over stock tips, but not always depending on the tips/IEM/your anatomy. Custom IEMs have everything put together in one shell and should perform better, however I only experienced a small difference between a universal TF10 and customized TF10, which you can read about here if you are interested.
Price range. I was thinking about €500 first. But when I got prices for the ACS and ES3x (€800 for triple drivers) I was thinking ow my!
Let's say my price range is €500 and I am looking for the best that money can buy. I will read some more reviews. At the moment I'm only considering customs or custom molds for existing IEM's with the signature I want. But because it's hard to really define what it is exactly that you like in a sound signature, it's still hit and miss. So I'm now looking into customs first. The reason I checked on UM3X was because price wize they are about a third without custom molds and like half with custom molds.
Are there people that heard both UM3X with or without custom molds and ES3X. Or reshelled UM3X?
Edited by s0lar - 8/9/11 at 11:24am