i like the vantec aeroflow . it is really quiet. replaceing the power supply alone with a dual fan , amd recomends dual fan power supply , will drop case temps alot . i would think if you tidy up the case like
this it will help out alot . NOTE your system has sound card and extra hdd so you temps are gonna be alittle higher than lot of what people post here . but this system i posted , this pic is of when it was xp1700 overclocked, it is now a barton 2500 overclocked to 2034 and the zalman was replace with a aeroflow hsf combo but i left the zalman fan setup in it , is running with a closed case and the loaded temp is 41-43 depending on room temp .