CPU or graphics card?

[David (PassMark)]

If you have streaming problems, then spend more money on your network connection and less on the PC. Even cheaper CPUs and onboard graphics can do high definition playback.

[20LEgend]

About to buy a new PC. I'm not a gamer but I like to stream movies, sports etc and suffer the usual buffering problems. Would I be better going for the best affordable CPU or best affordable graphics card to minimise this problem?