You didn't say how you were measuring your CPU temps. If it is with the in socket thermistor, then your actual CPU temps are probably higher than what's being reported. If you are using the in socket thermistor, your 60 degrees with the case closed is probably more like 68 to 70 degrees. Maybe even more. Too hot!
If you have a significant temperature differential between open case and closed case (which you do), then you need more air circulation in your case. Go to the front page ( overclockers.com ) and on the left hand side, click on "Case Cooling". There are several articles on how to cool your case. Stick with solutions that don't require radical case mods first. If that doesn't work you can then go with more radical mods.
Also, Go to the front page and click on "Click Here for Heatsink and Watercooling performance Rankings". Notice where the Stock AMD Heat Sinks are listed, dead last. To paraphrase Joe, "The stock AMD heatsink makes a good paper weight, and isn't good for much else." Now, pick a heat sink at the top of the list that will work with your Mother Board, and as Crazyman suggested, install it with Artic Silver thermal paste. I like the Alpha Pal 8045 heatsink, but it won't work with all Mother Boards. If you improve your case cooling and install a decent heat sink, your temps should go down.
Crazyman
I like your layout, nice and clean with no cable clutter. The way you dressed out the cables, you wouldn't happen to be/have been a Western Electric/Lucent installer would you?
Pudge