my comments:

.. 30mbps is very good; wifi is not a problem in yr case.
.. if u are only interested in eng, that is easy as most stuff available around the globe is eng, mandarin being #2.
.. live sports (esp in hd) will be a problem - these telecasts are big $, hard to get reliably for free.
.. hd only may be a problem - there are some tv channels that are easy to find in sd but not in hd for free.
.. yr hypptv from unifi... if not in use, use it - some shows are worth it.
.. ahem iptv - these are illegit stuff which we try not to discuss in public but u can pm the sellers.
.. yr smart tv has android built in. it can do more than youtube and browser. learn and try to put some more apps inside. the android in the tv works the same way as in an android box. diff is the memory, easy of handling and navigation. netflix works better on a certified smart tv than an uncertified box.
.. buying a standalone box has its benefits - can do more, can share knowledge with other users, get pre-installed stuff and help from seller.
.. take note - there is no box that will replace aztro. aztro is holding on to the biz with 2 things - proprietory live sports and canto channels. if u must hv either or both, it is going to be hard. but if u can live with pieces of alternatives, they are available.

overall, from yr description, i would suggest u:

1. use hypptv, get supersports channels (not as complete as those in aztro, though)
2. play around with the android in yr current tv - get help from a friend or neighbor, put in sa few apps and see if u like them.
3. check out netflix hd for yr tv; at rm42 pm, it is something u can consider - alto local contents rather limited, u get movies, tv shows, documentaries, kids stuff and food/cooking series - on demand only.
4. contact box sellers and ask for model suggestions, explore. i will not suggest any brand or model since for yr requirements, most will fit. just that if buying, do not buy the cheapest one. buy a higher end one - 2gb/16gb quad/octacore, lollipop 5.x - among the best available at this time.
hope above is useful, others will comment too.

The Minix Neo U1 has a 64-bit Quad Core CPU.

Install a subtiltle addon in KODI... Open media from Movie HD in KODI, during playback... Search for subtitle.

for MHD, you can get subs only if u choose "custom" when asked to play.

that will lead u to choose a player. depending on what u have installed in the box, you can choose es file explorer, mx, kodi, etc.

.. if mx, when video starts, click top right, u see options to get subs from opensubtitles. now, u need to register with opensubtitles.org on pc first to get id and pw to get the subs. you need to key in id and pw only once in mhd, it will remember.
http://www.opensubtitles.org/en/search

.. if kodi, it will open up kodi player. then u get subs just like when watching any video within kodi, assuming u already installed and enabled the various subs links like opensub, subscene, podnapsi, etc. (note in this mode, u r using kodi as a player, not as an app to stream.)

Hi. Everyone use Himedia M6? Wonder how the Mdtv iptv performence.