Upgrading a Sawtooth

[lavode at attbi.com]

Hi all,

I was wondering how upgradable the Sawtooth is.  I am in particular wondering 
about motherboard upgrades, and also if you can put a Superdrive in one.  Also, 
if I want to install a Radeon 7000 in it, do I have to unplug the AGP, or will 
the Mac run with two video cards (and their respective extensions) installed?

My last question (for now) is regarding the hard drive.  Does anyone know what 
the specs are for it?  When I upgraded my wife's iMac, I learned that her 
computer ran on an IDE 5400 rpm.  I would want to make sure I get at least the 
same speed hard drive.  What is the maximum speed the Sawtooth mobo can use?

Thanks!
-Lavode