General rule of thumb for airflow:
Front/ bottom/side - intake
Rear and Top - exhausts
CPU Cooler - front to rear flow
Mine is setup:
Front - 2x120mm intake
Bottom - 1x120mm intake(being replaced with 140mm Corsair quiet series)
Side - 1x200mm intake
Rear - 1x120mm exhaust (being replaced with 140mm Corsair quiet series)
Top - 2x120mm exhaust(being replaced with 2x140mm Corsair quiet series)
CPU - 2x140mm front to rear flow
Current temps PWM:
CPU:27
MB:22
FX:28
Under BF4 on ultra settings-PWM
CPU:40 max
MB:25 max
GFX:50 max
After this, I have no immediate plans. The fans were all I wanted to do just to have consistency with the look and performance. I think its time I enjoy my computer instead of tweaking lol
Flags
The picture you posted at the top of this page, is your GFX card being pulled down by something at the back of it? It looks a bit off centre :S maybe it is the picture im not sure.
Prateek
High ambient room temps will definitely have an affect on the ambient temp in the case itself. How are you montoring the temperature? That seems quite high for idle even with a room temp of what you mentioned.
I would highly recommend a decent CPU cooler, depending on what case you have, get a new one that can generate better pressures, and fans to assist with good airflow. Even a good front to rear blowing setup would work wonders.
And as qwarkdreams mentioned, thermal paste on its own will only do so much, even different brands have a differing of 1/2 degree so it must be down to flow.