Server Suggestion

[King, Michael]

We're going to be setting up a freeRADIUS server to service around 400
simultaneous connections.  (500 AP's, 4000 users, about 400 online at
once)  Accounting info would be on another different server.(Not part of
FreeRADIUS)

What's a good server for this?  What's more important?  Memory or CPU?

I was thinking a dell poweredge 750, 2.8Ghz, 1Gig of RAM, 73G drive.

Thoughts?