Reply to S2 vs S4

I have the perfect cunning plan to make money, by July I will have approx $1120, by earning $10 a day for four months. But now, i have two choices, I want to know the upsides for getting a S2 , and so for an S4.

I will mash songs, but I probably be doing a lot of looping and layering to make my own ones.

This is what I plan to get from the DJTT store

S2+Tma-1 headphones+ Midifighter=$798 and $322 left over.

Or

S4 + tma1 headphones+ Midifighter= 1223 and I need $103 from my parents, but it's the minimum.

So help me decide.