second first: I don't think a extra sub is necessarry
first question: shure
two options in general
a) IR-converter (e.g. Lintronic) http://www.lintronic.dk or irtrans.de
b) "special" DVD-player (with a integrated module), e.g. ulf-kiener.de or
http://shop.oneremote.dk/catalog/index.php?cPath=48_102