Hello. Im planning to buy a Drobo 2.0 with FireWire 800 today for use with my iMac. What sort of hard drives should I buy with it? Do 7200rpm hard drives offer any significant advantage over 5400rpm ones in external setups? I mean, wouldnt the maximum speeds supported by FireWire 800 be a bottleneck anyway? Since the price difference, in most cases, is significant, its important for me to make the right decision. Also, where do you guys think I ought to buy the hard drives from? I live in San Francisco. Thanks.