Re: DDOS
Personally I quite like 8.1, properly tweaked. I use it on my main workstation. That said, AMD no longer provide Win8/Win8.1 graphics driver s for their cards - you have to muddle by with the Win7 drivers. This is only going to get worse as 7 goes the journey.
That AMD still provide dedicated 7 drivers (which will go) but don't bother with an 8.1 - an OS that's supported until 2023 - version is disheartening. I've gone with their cards since the 4870 came out, but suspect I'll be back to NVidia and have to deal with suboptimal OpenGL performance.