Case fans will help some but its not going to make a HUGE difference. --- Corsair 500r ~ P8Z68-V Pro ~ i5 2500k ~ Hyper 212+ ~ Corsair 2x4gb ~ TX750w v2 ~ 560 Ti ~ F3 1TB ~ Crucial M4 128GB ~ Xonar DG ~ Tt Meka G1 ~ Asus PA248Q
It's not that more fans help. If you put a fan on every point that has a fan mount, they'll all be fighting to create airflow.
You need to carefully design your airflow and pick positions and sizes appropriately.
Typical airflow would be having front and/or bottom intake fans and a top and/or rear exhaust fan.
If you have more intake pressure than exhaust, you have positive air pressure in the case, and that can be a very good thing if your cooling is designed appropriately. --- Console war in a nutshell: http://imgur.com/xA6GJZ9
That's my case, if you look at the fan options, what would you recommend.
Make sure that any 200 mm fans you use are Cooler Master Mega Flow. BitFenix has the only other 200 mm that looks good, but it's supposedly terrible other than on paper.
What you've proposed sounds fine, just know that stock fans are usually terrible (unless you buy a good air heatsink like the Phanteks PH-TC14PE or the Noctua NH-D14, both of which have good fans) --- Console war in a nutshell: http://imgur.com/xA6GJZ9