do i need to add fans to antec 300 case?

I just got all my computer parts for my new build.

Phenom II x3 720 (going to overclock) (have aftermarket hsf)

saphire 4890 oc vapor x.

Do you think i will need to add additional fans to the front, or will the current ventilation system be suffice?

By the looks of it, it only comes with rear and top exhuast fans, I would definately install 2 intake fans in the front slots.

no, but why wouldnt you?

your better safe then sorry, im in the same situation, i had exactly one fan that came with the case, im going to put in 2 or 3 more, and the one fan was a small one on one of the sides of the case