Thanks for the answers, sorry for the late answer.
Finally, I`ve bought Dune HD Base 3.0. I choose it because there are no cooling issues as it has bigger case and a cooler. By the way, I`ve turned cooler off and haven`t experienced any heat issues yet. Well, it is not that compact as SMART, but it works. I don`t know about any feature in SMART it doesn`t have.
Regarding NAS, shared PC folders, it seems to me that it is still a 'geek' solution. I`ve bought mediaplayer to present it for my parents, and they certainly need all-in-one system, that`s why HD Base perfectly suits my needs.