I didn't bother to sift through the whole thread bu6t I read enough to seee that some of you have misleading and unfounded info here. to begin with, someone said the PSU fan isn't for case cooling...WRONG. The PSU fan is a key component in cooling the case, it exhausts the hot air from the case. I'd also like to address the side fan sucking air directly from the HSF. Unless your HSFan sucks air from the HS(most blow air onto it) then this can and will create "dead air". This is a situation where turbulence creates spots where the air doesn't move, it can be created when to directions of air cross and disturb the flow, or when the air is pulled or pushed in opposite directions. The proper airflow through the case should follow natural flow as closely as possible which is up. Hot air rises, so help it rise up and out. Your fans should intake cool air from the front(as close to the bottom as possible) and direct the air toward the back, the air is then sucked out the back at the top by the PSU fan(an additional fan near the PSU fan is also a good idea) Adding other fans can help if positioned correctly but you need to check the flow and amount of turbulence in order to maximize the cooling effect.
The only turbulent areas should be around any HSFs in the system, this includes those on the CPU, GFX card, chipset, etc...
The airflow in these areas should still move in the direction of flow although it is disturbed by the fans. Doing a "smoke test" can show you the airflow through the system. If you find problems, you can correct them by ducting and directing the air to correct the turbulence in the problem areas.
Another thing you might consider, the AMD HSF isn't very well made, you might need to finish the surface. I've seen some of those things that were pretty uneven on the surface that contacts the CPU. I'd recommend a better HSF but if nothing else you might want to make sure it has a smooth flat surface.
One more thing....Arctic silver is one of the best heat transfer compounds I've ever seen(there are some better but they are pretty much for industrial use only) Be careful when you use it, getting it across connections can fry something. No matter what anyone tells you, Arctic Silver is conductive and Will conduct electrically, although not well, it is enough to kill something. If you doubt that, just run a thick bead of it along a table and check each end with an Ohmmeter.