If you get 8 with your computer for some reason that is one thing, but I don't get spending a bunch more on Windows 8. What value is there? Other than a few aesthetic things (like the file copy screen), there is nothing to Windows 8. The performance margins are well within the margin of error from Windows 7 for the most part. And you have to deal with the crappy interface that Microsoft will just try to force you into as often as possible from now on. No thanks.
You can shut ofs the metro interface and it won't bug you anymore, to the point where you forget it's even there. But I agree with everything else. Add to that if you're a gamer, expect to rage over some older titles completely unplayable in Win 8.