Your case temps look awfully high. a CPU temp 10 degrees hotter than your case temp isn't THAT out of the ordinary.
First thing I suggest you do (if you want to have a little fun for free) is to mount a fan on that duct across from your processor (chop it up, drill screw holes etc etc) I built my brother a computer for $200, (he allready had a monitor/keyboard/speakers/mouse) so I just put in an Asus a7n8x, 256 megs of ram, Athlon 2000+xp, a Maxtor 40 gig drive, wireless lan, and a Geforce 2 TI (came to like $200) I allready had some of the parts. But anyway all I had was one spare case fan so I put that infront.. CPU temps were hitting 63 load, about 52 idle.. not acceptable. So I cut a hole across from his processor and dropped it in (no ducting or anything) new temps with no other case fans besides the PSU are 35 idle 43 load =). He's happy, I'm happy and most importantly the processor is happy. With a 20C drop just from a cheap case mod like that.. pFFt I'd say go try it. Plus he really likes it because he can finally see the LED fan.