You could spend another evening comparing equipment online. Or you could spend it recording your demo. Scarlett 2i2 Studio Pack gives you everything you need to easily make studio-quality music on PC or Mac.
If you want to record two vocals at once, or mic up your vocal and guitar cab separately, take a look at the Scarlett 2i2 Studio Pack.
Microphone and Cable: CM25 large diaphragm condenser mic for capturing crystal clear sound, plus a three metre XLR mic cable and stand clip.
Headphones: HP60 closed-back studio headphones for blocking out background noise.
Scarlett 2i2: The top selling USB interface in the world, for recording studio-quality audio.