I meant 754 not 775 :)
If possible use a dual core CPU and fairly modern MOBO, while the recommended requirements are very low for WHS, it seems to favour dual core chips.
I cant stress enough though how much you need drivers on hand with the install, Server 2003 if possible, but due to its age not always possible, but as I keep mentioning XP at the very minimum.
99% of WHS installs do not go to plan, any issues then come and post here :)