Fastest (IO) micro ATX motherboard

[Dan Carroll]

Hello,

I'm thinking of putting together a couple of custom built NAS boxes (4 
drive) to use up a plethora of SATA drives I've accumulated.
I'll be running ZFS probably in mirrored or raidz arrangements.

I'd like to be able to get good enough performance so that things like 
iSCSI are viable over my home-office lan (gigabit lan with less than 20 
devices).

Does anyone have any suggestions on what chipset / motherboard might 
have reasonable IO performance?   I'd prefer not to go into this 
endeavour only to find out my disk access grinds to a halt when the 
motherboard needs to talk to the network.

Things like WOL, low power usage and small form factor are also 
important.   Hopefully I'm not asking too much of the micro ATX form factor.

Any ideas?

-Dan