about the networking thing, it depends...
I THINK If you are going to have a hub in the bottom of the case with two newtork cards and an ethernet cable, then that could be debatable (did i spell that right?)...
If you are thinking of having some kind of parrallel processor with a raid system for some kind of server, or somthing crazy (but on a MUCH scmaller scale) like
clicky then that might be worth a shot... Don't bother with parallel connections or serial cause they are too slow, and you'll get pissed off with them quickly...
An I THINK is never wrong :-D