The OD deal is B&M only AFAIK.
There was a coupon that was mailed to people that was good for 15 off 50. (
Unless you watch DVDs on your computer, I don't quite see why the one speaker makes a big difference except in price. Current games most likely don't use the 5 speaker setup although future games might. I personally think headphones are the best (at least for FPS). The non 5.1 bundle includes Decent 3, Theif, NFS4 and 5.1 contains MDK2,UT, Dues Ex and Theif II if I recall correctly. Here are the specs for the SBLive
linkdafied and the 5.1
linkdafied
the code can be traced to seventy two squared plus fiftynine
hope this helps