Sounds to me like you have more air going out than into the case. Try reversing/re-placing (as in placing fans in a different area in the case) fans to get a little positive pressure going. Make sure you have proper airflow over the motherboard, esp. the processor. My case has a lovely hot spot in the area at the back where the PS/2 and serial connectors are. Since the processor and AGP and Chipset are all right there on the edge, I had to eliminate this. I found about -2C from reversing my blowing 80mm here. Unfortunately, this had undesirable effects elsewhere. My temps were quite high until I cut my duct/suck hole above the CPU. When I did this, it took my temps down 5C with duct, 7C with 38CFM 80mm.
If your case temps are as low as they are all the time with your current setup, you might seriously consider getting rid of the pretty orb. As much as I like the looks of it, I think you should look for other cool coolers...there are a few.
Look
at this overclockers article "Heatsink Roundup" for some ideas. Since this article came out, there have been a few other coolers introduced...the AX-7 wasn't covered and neither was the Volcano 7+ just to name the two that come to mind. You could always get out your spray-paint and color a fan to match your scheme in-case.
Glow in the dark stickers sounds like a cool idea, by the way.
