I agree with h11013. There is a sticky thread in the Apache forums listing what each of the extended_rom cabs are, what they do, and if they are required/optional/junkware. You can look at it here:
http://forum.ppcgeeks.com/showthread.php?t=3660
It would be nice if there were something similar for the Titan.
BTW: divxrippimp, is all that in the base memory or are you heavily relying on a 6GB card
