I know this maybe a two month bump, but coming from a let's player standpoint, I have to tell you that a microphone will always pick up keyboards and mouse noises so long as you don't edit the audio. You really should try out a program called "Audacity" to remove any background noises, rather than spending 100$ on equipment that is literally just an expensive version of what you had before.
Then again, you probably decided to quit already, but I thought I'd give my own advice.
Are you an ASM coder
and want to trade "resources"? Private Message
me for details.
(I also offer SMW Custom Songs in exchange for ASM! I don't do ports though unless it's to remix.)
Want progress on 100 Rooms of Enemies: The Nightmare Edition? Go here
Are you a sample porter
and wanna help with 100 Rooms of Enemies: The Nightmare Edition
? Private Message me
for details. Expect trading "resources" in exchange. 4 more left.