I have basically that same driver set. Makes sense because I'm running the same Win7 beta driver package (which behaves identically to the Vista driver BTW).
And ha10kx2k.sys is the driver identified in all my BSODs, as it is in other reports I've found on the web. This seems to be the primary I/O driver, while many of the others are obviously involved with the onboard DSP functions, which I'm generally not using.
I am going to try to make time to uninstall and re-install everything this weekend, booting the machine with the card out of the slot at least once, and see if there is any improvement.
But as I mentioned, I do not have a recipe for reproducing BSODs on my system. I pretty much just have to wait for it to happen, though I can probably speed up the process my making a lot of I/O changes.
For refrence, my interface shows up as E-MU E-DSP on IRQ 21, shared with Intel ICH9 Family USB Universal Host Controlller - 2938, and nothing else. Also as mentioned, leaving that port disabled for a period of time did not improve stability. As a result, I don't think IRQ sharing has any bearing on this issue.