I have a 6890A and while I was looking at Addtronics site I noticed they have a CPU fan/bracket that blows on the CPU and AGP slot. The problem is I have my HDD's on a slide out tray that is in the spot where the fan would go. Here is the question, the fan would have no intake as the case door has no hole in in this spot so it would just be blowing hot air at the "goods". I can move my HDD's but if this fan just blows hot air around would it be worth the money,it's only $15. Right now I have two fans in the front and two in the doors blowing out. I'm going to get the 6x6 that goes under the PS. The newer cases have a 9x9 under the PS. 
So fan? Or no fan?
So fan? Or no fan?