I have definitely decided on this case. As it turned out, my wife ordered it for me as a Xmas present not knowing that I still wasn't sure that I could find a heat sink that would work with the wind tunnel.
I have the complication of working with an LGA775 system - there are still a limited number of heat sink designs available. I would have liked to go with the Silverstone solution (NT01), but for now it is Socket 478 only. I asked Silverstone tech support about LGA775 support and the answer I got was:
"the NT01 for lga775 will be ready I will say two months from now"
So I guess I could have waited, but I was impatient. Besides, I had just "discovered" the Arctic Cooling Freezer 7 - something MikeC also recommended as a possibility. It looks like it should work well with the wind tunnel regardless of the angle of the air flow - something that worried me about the XP-90 and XP-120.
On almost every XP-90/XP-120 installation I found pictures of, the fins would end up running across the air flow instead of with the air flow. I found exactly one picture of a system that showed an XP-90 with the fins in the correct orientation - and that system was an AMD. I decided it wasn't worth taking the chance - and in any case, I was pretty sure that the XP-120 would not fit. It is just too big unless the position of your motherboard CPU socket is PERFECT for the wind tunnel alignment - what are the odds? In any case, the XP-90 would probably be better, since it is taller - but again, the fin alignment is an issue.
So, I was looking at the Thermaltake towers - either CL-P0024 or CL-P0025. Because the fins on these towers are horizontal instead of vertical, they really work with an air flow from pretty much any angle. The only problem was, MikeC had pointed out a significant flaw in the mounting of the CL-P0025, and I assumed the CL-P0024 probably had the same problem.
I was just about to give up in dispair, so I wrote MikeC and asked if he had any suggestions. After I wrote him - but before he had a chance to answer - I found a review of the Arctic Cooling Freezer 7. I had just about decided it looked pretty good when I got MikeC's answer - in which he said he thought it might be worth a try.
To top it all off, it turns out that Directron has it on sale for $22.99
- a ridiculously low price for a "performance" heat sink for an LGA775 CPU. Arctic Cooling says this heat sink is good for LGA775 processors up to 4.4 GHz - that it can handle 200 Watts worth of heat. I hope it will dissipate the heat from my 3.6 GHz CPU using just the air flow from the wind tunnel - I hope to be able to remove the dedicated heat sink fan. If it turns out the dedicated fan is needed, I still believe the wind tunnel has a good chance of contributing significantly to the CPU cooling because of the unique fan mounting on this heat sink.
Another big advantage of this heat sink is the fact that it is designed to use the stock heat sink mounting - no "universal mount - one size doesn't fit any" problems. If you would like a Freezer 7 for your Socket 478 CPU - you are out of luck. Of course, they do make a virtually identical heat sink that DOES support the Socket 478 - it's called the Freezer 4. For AMD CPUs they sell the Freezer 64. Of course, Directron doesn't have the same great price on these - they're even cheaper! $21.99...
So - I'll let you all know how this setup works. Of course, I still have to come up with some RAM and a PCI-Express video card, so it will be a few more weeks before the system is booted up.