As I'm not able to edit my post(?), on the AMD Motherboards you can choose: 
  
Asus M5A99FX Pro R2.0. 
Asus Sabertooth 990FX R2.0. 
ASRock 970 Extreme 4. 
Asrock 990FX Extreme3 
Gigabyte GA-990XA-UD3. 
Gigabyte GA-990FXA-UD3 Rev 4.0. 
MSI 970 Gaming. 
MSI 990 FXA Gaming. 
  
I looked at the differences between the i5 4690/4690K and the AMD FX series @95W about power consumption and is around 11W to 4960 and 7W to 4690K more power thirsty, it's not a big deal compared to graphic cards consumption, and you can save around $40, or even more, depending your budget, here is a list of FX processors: 
  
AMD FX 8-Core Black Edition FX-8370E FD837EWMW8KHK Cores: 8 Speed/Max: 3.3 GHz/3.6 GHz TDP: 95W Socket: AM3+  AMD FX 8-Core Black Edition FX-8320E FD832EWMW8KHK 
Cores: 8 Speed/Max: 3.2 GHz/3.5 GHz TDP: 95W Socket: AM3+  AMD FX 8-Core Black Edition FX-8310 FD8310WMW8KHK Cores: 8 Speed/Max: 3.4 GHz/4.3 GHz TDP: 95W Socket: AM3+  AMD FX 6-Core Black Edition FX 6100 FD6100WMW6KGU Cores: 6 Speed/Max: 3.3 GHz/3.9 GHz TDP: 95W Socket: AM3+  AMD FX 4-Core Black Edition FX-4100 FD4100WMW4KGU Cores: 4 Speed/Max: 3.6 GHz/3.8 GHz TDP: 95W Socket: AM3+  AMD FX 4-Core Black Edition FX-4300 FD4300WMW4MHK Cores: 4 Speed/Max: 3.8 GHz/4 GHz TDP: 95W Socket: AM3+  AMD FX 8-Core Black Edition FX-8300 FD8300WMW8KHK Cores: 8 Speed/Max: 3.3 GHz/4.2 GHz TDP: 95W Socket: AM3+ 
  
With them you can use a wide range of RAM Modules ranging from 1066MHz to 1866MHz (also depending your budget). 
  
For the tropical weather, Liquid Cooling is a good friend, Antec and Cooler Master have good systems at reasonably prices, and for the coolant you can use car coolant, in my case I had to switch to LC because I live in front the Sahara Desert, the floating dust on ambient from some continental winds hitting the Atlantic is a pain to clean on an conventional CPU fan, and not to tell the temperatures when the island is covered with dust clouds.