I think id still go for VLC,
1, Its stand alone does not require and other componants to run
2,simple to use but as a few nice little gadgets with it.
3, It will play nearly anythink you want.
4,Its a verry small file I.E almost all players are around 30 to 40 meg were vlc is only 6.
5,will run on verry low spec systems, basicly it adjust itself to run on your system(althou on really low spec it will run but not fantastic)
AND ITS FREE TO ANYONE