WTX-8500 Case/Cooling Question

Hi,

I've got a question regarding cooling in my case, the Addtronics WTX-8500. You can view the specs here: http://www.addtronics.com/wtx8500.htm

Anyway, I want to know how hot is too hot. I've got one of those little digital temperature control things with the probes... One I have hanging inside the case, and the other I have on top of my hard drive (but not covering the little air hole). Based upon the readings, the internal temp ranges from 85° F to 105° F depending on the temperature in the room. The hard disk temp is usually around 100° F to 115° F. I have four fans (9 cm I believe) mounted in the front and three (7 or 8 cm) mounted in the rear. The front sucks air in and the rear blasts it out the back. Below are a few of my questions.

1. Is this too hot? The hard drive is SCSI, so it'll be a little hotter than IDE.

2. If it's too hot, any suggestions for decreasing the temperature? Based on the case design, I can add two more fans; one more in the back and one on the side near the drive bays.

3. Are there "special" fans that will yield greater cooling than the ones I currently have?

Again, I'm just trying to make sure that everything is going to work at 100% for a while. I haven't noticed any problems related to temperature, but I have read that sometimes performance and reliability is increased as temperature decreases.

Thanks for your help and taking the time to read my post!!
Andy