LaCie 500 GB USB 2.0? http://www.amazon.com/LaCie-Externa...6CBA4/ref=pd_bxgy_e_img_b/103-7367105-7245431 LaCie d2 500GB Quadra http://amazon.com/dp/B000NAFEX0/ref...&pf_rd_t=101&pf_rd_p=288448601&pf_rd_i=507846 is the speed goin to be that much of a difference? I noticed the USB 2.0 is 8MB Cache while the d2 is 16MB cache..is this anythin to consider? I'm using the drives to for storage backup I'm now leaning towards the Seagate FreeAgent Pro 500GB I also have some Diamondmax 10 200GB HDs but 1 of them has windows XP on it.. could they still be used as an external? and what is a cheap enclosure i can get to work with the diamondmax 10?