What Kind of Microphone Should I get?

I am an amateur mix tape rapper and I am looking to finally start recording my music using a legitimate studio/condenser microphone. I am looking to make a small in home studio (condenser mic, spit blocker, tall stand, etc.). I have little knowledge of what microphone to get for my situation but i have a budget maximum of around 110-120 dollars. I want to be able to plug this mic into the back of my iMac computer so I can create these songs off of garageband. Any Suggestions? Links would be nice. Thank You