First of all, i reached 1000+ posts! :D

Ok back to the topic. What is a good mic for windows 8.1 for voice acting, and it has reasonable price?

having a decent mic is important, but i think the key thing is the post-production - ie. background noise removal and that sort of thing

Can you tell us what's your budged?

"Blue Yeti" is a good option.

It's not expensive but it delivers.

Thank you for all of your suggestion guys, but I already bought a headset microphone, it's Logitech H15. Tho' it doesn't work on my laptop because my laptop doesn't have analog connection, but it works perfectly in my sister's laptop, so i'll use it in there