No I'm not the owner...but if the manual book says can do, for a reputable brand...sure can do one..

But how well it can do it, I dunno, thats why I said 'Feature wise' it rocks....but real performance wise I dunno...I dun have one.

Owner of LA32B650. Response to your notes:

1. with USB2.0 movies I can watch any movie files except RMVB, from thumbdrives or HDD (capacity of 500GB.)
    True. Tested with my thumbdrive & my external h/d (120g) . Plays all my downloaded movies.

2. can surf the internet with 'Internet@TV'
    hmm at the moment i hv in the tv : youtube and weather widget only. So it is not literally surf the internet. Maybe with new firmware have more widgets.

3. watch content from my PC ie wireless streaming.
    True, I am using LAN instead of the wireless. Watch those d/l 720p (mkv). Fuyoo. Is amazing. Oh it is not just plug and play,you need to install    Samsung software in your pc in order to view content from pc.
  Take note if you want to use wireless then u need to purchase samsung wireless dongle thinggy. I think is about RM299 or something

I bought mine last mth RM3045 (12mths) installment, 1 yr warranty period and im using mainly with my xbox (classic) .

For that answer, we need to look at the manual book:

Audio outputs / sound processors:
Outputs:
1.The normal RCA
2.Digital Audio Out (OPTICAL)....good for 5.1 to the amp (provided the amp supports optical)

Processors:
Other than the normal audio, it supports Dolby as well, so if you are using the On Board Media player, download only those movie which has Dolby sound if you want it to sound from the TV speakers.
DTS stuff will not sound at all, but by using the Optical out connected to a amp that has DTS, there will be sound from the amp to external speakers.

But due to you are using it in the bedroom, well, its up to you to decide what is best.

Take note, for bedroom installation, it must be high and at the steep angle, if not you will have neck pains.
Also, make sure you have access to the main plug and the aerial plug to avoid getting strike by lightning when you are out.