Reinstall or reconfigure RHLE on Dell Server

[listvj]

I am configuring a Dell server for a client of mine.  It will ultimately 
be an internet web / mail server.  I haven't used Linux for a few years, 
but I have been working with BSD OSes.

Red Hat Linux came pre-installed on this machine, and I'm wondering if I 
should re-install or just re-configure the current configuration.  It 
seems as though the default install was a Workstation install - Gnome 
desktop is starting automatically.

Is there any significant difference in the different kinds of installs? 
  I gather that the Server install would partition the disk differently, 
but LVM, which is installed, seems to provide the same functionality 
with more flexibility, so I wouldn't re-install just to repartition.

Also, I imagine I can disable starting the GUI at boot time, so I guess 
my question is, is there any benefit (other than an educational one) to 
me re-installing RHLE?

Thanks.