i have a linksys wireless N router, and i play CoD and stream netflix. never have to buffer unless i rewind. only takes a few seconds to catch up and then i have no hiccups the rest of the movie, however; this router is like 3 years old and i hope you find a better one! ive been in the market to upgrade as well, have you researched the Time Capsules? i need an external HD too and im thinking about buying one of these, if the I/O is very quick and the N router it comes with is fast enough