There is a thread somewhere around here comparing the best air cooled heat sinks and some AIO water coolers. They are pretty close. But considering the temperatures you are living in water cooling sounds like the plan. I live in an air conditioned house and will stick with air. Have you considered a $100 window air conditioner?
Here are some pics I took showing what I done went and did.
The 1st one shows the rubber foot I glued to the case to support the motherboard.
The next two show the relative size of the coolers.
There it is bolted down solidly with the washers holding it down. No I had not cleaned the goop off the cpu yet.
Looking down showing the wind tunnel between the heat sink fan and the case exhaust fan.
If you look carefully you can see the fins of the Thermalright cooler sticking up behind the fan blades. That fan is rated at 110cfm and there is a strong wind coming out of the back of the case.