[fivepointone]

I am in doubt with the i3.

How is it when it is running XMBC? I plan to run a Windows 8.1 OS on the machine, for being able to run Netflix and Viaplay (Scandinavian alternative to services like Netflix).

I'd recommend going with the i3;

I run viaplay live sports on my D34010WYK with win 8.1 Pro and it works like a dream, just make sure you use the dedicated viaplay win8 app, using a browser you get a silverlight stream that stutters a lot, the app though is far better with smooth playback and no quality issues so far for me.
Oh and xbmc is lightning quick on it too.