[DGD] good hardware for a mud

[Shentino]

In general, what tends to be the biggest bottleneck when running a high
performance mud?

>From hobbyist one-man-stands to large scale operations such as Skotos

My first guesses would be
* networking
* hard disk speed
* memory
* CPU

Though which of the above tends to matter the most I'm not exactly sure of.
 I'm set to purchase a new mobo and case from newegg and I'm wondering what
I should look for.