Almost all new servers contain virtualisation support thanks to the latest revision of CPUs. New core2 based Xeons and current Opterons have built it support.
As to spec, lots of ram 8GB, a couple of quad core CPUs and some quick storage will do quite well for 6 or so vservers depending on loading requirements.
You may want two of these rigs for redundancy as if your one virtual server blows something it will take out your whole system.
A SAN is the best as you can have both VM servers storing their images on the SAN but short of that a reasonable RAID controller with a stack of cache (512mb) would be a good idea.
You can virtualise any of the roles that you suggest above, if you go for the SAN option it may be faster to host files directly off that.



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