It sounds like your all set. I don't know the technical issues of video coding or how a machine gets locked into one region or another, presumably with a chip that the machine will not function without that might restrict what can be played on it. In any event region free sounds like what you need.
As for the number of channels you would like in a surround system isn't that a matter of personal; taste. The old standard (I am a stereo guy so take this with a grain of salt)was 5.1 then it went to 7.1 or more then 9.xx etc. It is really what you will like. I have read people say 3 channels makes them happy and other invest fortunes in custom installations.
I would assume the old 5 channel systems would be sufficient. Surround is not however "audiophile" stuff most of us are 2 channel you will even find some mono enthusiasts.
As for the number of channels you would like in a surround system isn't that a matter of personal; taste. The old standard (I am a stereo guy so take this with a grain of salt)was 5.1 then it went to 7.1 or more then 9.xx etc. It is really what you will like. I have read people say 3 channels makes them happy and other invest fortunes in custom installations.
I would assume the old 5 channel systems would be sufficient. Surround is not however "audiophile" stuff most of us are 2 channel you will even find some mono enthusiasts.