Financing is a horrible idea unless you know for a fact you'll have the money ready and there's no way you can get it now.
To picture the whole idea: Atm i got 300 Euros, next week ill get payed from my job ( around 300EUR) and since i am still a student i am fortunate enough to have a family that can lend me some cash if im in trouble
Another question i got, is it possible to install Win7 without a CD? meaning i can use a USB or external drive to do it?