[Xickle]

I'm ordering the headphones from www.thomann.de, so it would be nice if the microphone came from the same store. Of course it's not necessary, but the shipping will then double. 
 
LINK: http://www.thomann.de/gb/microphones1.html
 
I don't even know what category to look in, as I am completely new at this, but the main reason I want the mic is for talking over Skype and doing some commentary on videos. No singing or anything like that. I'd like the cable to end with a 3,5mm jack, but a USB is fine too. If possible I would like to spend max 50€ for the mic.
 
Bonus points if the mic goes along with the DT-770 look

 

[ThickGlasses]

If you can save up a bit more money, I'd go for the Blue Snowball. Mine has served me for about 3 years and IMO is basically the AT2020 but cheaper (not to mention the black one goes well with the DT770 PRO).