for planning a multizone setup, hijack is going to be the best person to help, and he hasn't been on as often lately-- try checking his multiple build logs(i think he is on log #3--mostly mistakes he made along the way of making the ultimate mz setup )
the i7, is way overkill. i believe he is using a pentium/core 2 duo for the 2-zone system, and a core2quad for the 6-zone system..
the m4 also won't power that. you are pretty much limited to what the dc-dc psu can power. and with that high of power requirements, even the opus 360 isn't enough.
the 4gb of ram is normally more then needed for a single-zone setup, but i believe that is required for mz. just keep in mind taht you need to use a 64bit os to use 4gb. 32bit os's can only address 3gb of memory(technically, it is something like 3.25).