What hardware is recommended to run a HL1 server mod?

[Tycho Blackwood]

I'm wanting to run a HL1 mod server with some very expensive plugins. I'd like to know the general range of hardware I should use for this 32 player, HL1, heavily plug-inned server.

Info requested: CPU, RAM, Network Connection speed.
HL1 = Half Life
Sorry for not being clear on that.