Yes, I bought the DP965LT because it was recommended here. I know that it probably isn't the problem in itself, but switching motherboards simply has a very high probability of fixing whatever the problem is as a side-effect, since so many things change with the motherboard (a hardware version of
shotgun debugging 
). Also, I did find someone having problems too with the P965 chipset on
this thread.
I'm considering the Abit IP35, since that provides 3 PCI slots and firewire (which I need, since I have the possibility to borrow a Powercore FW for bigger projects). One thing that makes me a bit nervous about that is that it also has an intel chipset, so there's a slightly bigger chance of my problem recurring than if I went for some totally different chipset. Intel just seems to be highly recommended.
It's true that the Creamware cards can be a bit of a pain in the *ss occasionally, but on the other hand I've had the Pulsar II for five years with no serious problems and working perfectly most of the time, and I'm definitely willing to go through the trouble it takes to get it to work. As people here say, there just still is no other card that does what the scope series does, with comparable sound quality.