Well, thanks so much for your comments. Actually the comment from GearMe on the first page of this thread was the reason for me to question whether or not would be the he-400 good for me so I am really glad that you had something to say
Anyway ... Waiting for 400i is out of the question and the biggest reason for it is the price. If I went for something as expensive as the 400i i could probably afford the he-500 or even senn hd700 - av stuff is really strangely priced here in Czech Republic
This damned country is also reason why mad dogs are out of the question - not sold here and I am not a huge fan of international shipping - I am just scared
Unfortunately enough listening to he-400 is impossible as well. The only place where I could listen to them is literally across the whole country.
So I ended up with 3 options
1) safe bet on 880 - get very comfortable headphones with sound that I would most likely enjoy and that are also a lot cheaper
2) get the he-400 until they are all sold out
Many people say that the sound is much better compared to 880s, also I would really like to get orthos and I would really appreciate removable cable. Also I would be able to run them from the fiio e10 for a few weeks until I would be able to get better amp( unlike the option 3).
3) get hd600 - only interesting because of the same price as he-400 - however very improbable. I don't know much about the sound signature and I would probably have to get much better amp
So I guess I will most likely get the he-400 , give them proper burn in and see. And if the sound ends up being real disappointment I can still return them within 14 days - but I think I am going to like them - I definitely hope so.
Sorry for such a long post and thanks again for your replies.
I value the opinion of GearMe very much, unfortunately I just don't have the option to try them and they still have many reasons to be a good blind pick.