yup they would sure help, but your case is a giant, a midtower would be better affected because the flow would be more direct
your front slot is way on the bottom and your back is up high so they dont crossvent too well, i would definatly get two side intakes and use the back for exaust and maybe an exaust on the top of your case if you have a slot there, but the front will only help very little if you have like hardrives directly in front of the fan that air wont go far.
maybe get a pci slot cooler with dual fans to move the air down there
and maybe even a 9500 zalman for your cpu that would get things flowing really well
bfg tech 7900GT@475 still ll 3200+ firstname.lastname@example.org, 1.55v ll OCZ 1GB ll WD 320 GB hdd