Well, i put my sister's com inside a Sonata and it's running great ATM. She's got a Intel 2.0GHz proc (400MHz bus) on a Asus P4B533 mobo. I put the Zalman CNPS7000A-AlCu on the CPU and now it's currently stress testing at 2.5GHz (125fsb). It survived 6hrs at 2.4GHz so trying 2.5GHz now. It's virtually silent cuz I can hardly hear it when the side is closed and when the side is open, the only sound is of the air rushing through holes. MBM 5 reports that the CPU temps is at 38 degrees C at full load for 3 hrs (max temp out of the 3hrs). I know the MBM temps are most probobly wrong, but still, at worst case scenario, it's only off by about 10 degrees (from own experiance) and im hardly feeling any heat comming off the zalman at all.
Also, Hookem, there SHOULDNT be much dust inside the case because there's a dust filter in the Sonata at the front. Did u actually install it at all?
IMO, the location of the front fan mount is OK, as it helps cool your VGA card. It pulls fresh air in through the front and blows directly on the graphics card and it increases the effectiveness of Ramsinks alot (passive to active cooling).
But i think you people are forgetting something. The Sonata is for people who want a silent PC, not people who want the best cooling (one of the reasons why i chose the Zalman heatsink over the others).
The reasons why i chose this case over the others is:
1. Availability issues here in HK
2. Dual 120mm fans
3. Dust filter
4. Inclusion of a very nice PSU
5. Amazing finish
6. Silence