I did a similar thing on csgo blackjack I started with $40 and got all the way upto $1100 somehow so I withdrew a stat trak karambit tigertooth then a few hours later I put it back in and got to $2.5k and was hoping to double it again so I did a 1k bet and lost and then another 1k rage bet to...
If you do go with the AT2020 make sure its the USB one or you'll need to buy loads of other stuff for it.
http://www.amazon.com/Audio-Technica-AT2020USB-PLUS-Condenser-Microphone/dp/B00B5ZX9FM/ref=sr_1_1?s=musical-instruments&ie=UTF8&qid=1450754239&sr=1-1&keywords=at2020+usb