asterisk users - Dec 2005 - Motherboard choice for large opteron based asterisk server?

Hi,

I am in the process of selecting an Opteron based server and am looking 
for other's experience with various motherboards and the TE411P 4-port T1.

Right now I'm looking at a Supermicro H8DA8 based 2x dual-core Opteron 
system.

http://www.antonline.com/custom_CSE822T-H8DAR-SATA-_59.htm

And a Tyan Thunder K8S Pro based dual single-core system here.

http://www.serversdirect.com/system_dept.asp?dept_id=SD-030

Comments, suggestions and experiences wanted.