thx for reply and advice, really appreciate it. Since my J3 hasnt arrived yet (and it will take some more time I guess, somehow it takes ages to resupply cowon stuff in our country, waiting for my 4GB J3 for 2 weeks already and its still out of stock) I have some time to think about which card I actually need right now because atm I have budget only around 30e for microSD card, which is enough for Transcend 16GB class 6 (or if class 4 is enough, then Kingston 16GB class 4 for 22e). But if they have good price, I can get few of their cards in future, I want to have everything with me all the time (couple of series, some movies etc, atm its around 185GB collection of episodes of different series, I think I will shrink it to ~100GB with reencoding everything to 480x272 format but still, its still at least four 32GB cards, and thats a lot of money).
I have read pm u send me, already send an email to them (about prices, shipment etc), waiting for their reply. Will see if they can satisfy my needs, because I live in Slovakia and paying for example 20e for packaging+shipment would be same as buying new card here.