Search for a E1G42ET as it will do the job and is around 130.00. Note the ESXi management network can use a shared network port as long as the chipset is ESXi supported. Having a dedicated port is really overkill as the traffic is minimal. Put your management network and your DC on vSwitch 3. Unless it is not supported, there is not much reason to do IO passthough on the network now. ESXi 4.1 used to have quite a bit of overhead on the networking but now with ESXi 5.1 you can easily get good speed without passthrough and you will get better use out of it.
RB
Thanks for the advice. I think I will still need a 4 port NIC as 1 will be used for management/DC, 1 to connect to the Untangle appliance and 1 for the DMZ.
An updated diagram:
<img src="http://www.gliffy.com/pubdoc/4037104/M.png"/>
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