Bear in mind the 812 cannot burn dual-layers but the 832S can. A dual-layer DVD has exactly twice as much space, so twice as good lol! It is however slightly less than twice the price so take your pick...
If you do go for the 812, search for a firmware update that supposedly lets you burn dual-layers with the 812. And err let us know if it works lol! (Y)
Keep hacking! (Hacking in the 80's sense of the word not hacking as in illegal-breaking and entering ;-))
Daniel