If I decided to end up going for a mac pro with pure speed, I would want to fill it with 4 SAS drives. I've heard that SAS drives are completely unrivaled in speed (15,000 rpm ), but does this really correlate to high speeds? Is Apple's RAID card the best solution for SAS drives? I would likely use RAID 5 setup for striping benefits as well as data redundancy. Now, I'm a bit of a storage junkie, and SAS drives won't be a viable storage solution for everything I have already (and even more in the future), so external storage would be a must. I have a drobo already, and it is a much cheaper solution than getting something like an Xserve RAID, and firewire 800 is plenty fast for streaming video, even to multiple sources. My question is what will happen if I hook up 4, 5, or even 6 drobos? How does daisy-chaining many storage solutions affect speed? I won't be buying a Mac Pro until the next generation, and I'm assuming that there will be 2 firewire 800 ports, but will this even be much of an advantage? How about RAID striping across chained firewire? Hope all these questions can be answered.