After looking at the workstation you have, if you can return it I'd look into buying a more compatible workstation with Win2k3 x64 so that driver compatibility isn't an issue. For a developer workstation, I can see how Win2k3 x64 is absolutely necessary so really the machine needs to change in order to run it. As this might not be an option, I have another idea.
It looks like your computer is more of a low-end desktop. Assuming you have enough memory (2GB+), maybe another option would be to run Windows XP x64, and run Windows 2003 x64 virtually (for free) with VirtualBox. It's a bit a of a stretch, but you can tune more resources for the server and VirtualBox maybe able to abstract the chipset/sound and get the underlying host OS (WinXP) to take care of the issue for you. Again, it's a bit of a long shot but it could resolve your issue. I'd read up on the VirtualBox site and all the compatibility issues (maybe like running a 64-bit guest in a 32-bit host, or dual monitor issues) for more information.
For your dual monitor situation, I'd add an additional (compliant) video card. Matrox, nVidia, etc. would probably be better suited for dual monitor setup. Now, I don't have any experience with running VirtualBox and dual montior setups so again, refer to the VirtualBox site.