Configuration?

Thanks for the swift reply. The Pro will make sense as Logitech Media server is likely to need more horsepower if I decide to start streaming video. Unlikely at present as the big selling point of Blu-Ray is Dolby TrueHD uncompressed digital audio. Given the incremental cost os starting with 3 2Tb drives is only £100 - is it worth starting off with extra redundancy 3 discs will offer, or do you need 4 in order to benefit? Music will be archived off monthly to a USB hard drive stored with a neighbour, and user data files on each Mac synced using Sugarsync.