I've been running with the 160Gig drive that came with my Rev C dual 2.0 G5 and it's about time I bought an internal drive to hold my media for Final Cut Pro. I'm bouncing back and forth between the Hitachi Deskstar 7K250 and the MaxLine III. The MaxLine has a 16mb cache vs. Hitachi's 8mb. What kind a difference am I really looking at? Will it matter the system drive which came with my G5 has an 8mb cache, as I assume it does? I've had good luck with both makers and trust them equally.