I have two options for my new external hard drive which I need help considering. Option 1 is getting a pair of seagate 400gb(ST3400632A-RK) and using this raid enclosure from owc(OWCMEFW912AL2). This would come to about $350 for 800gb striped or 400gb mirrored. Option 2 is getting a seagate 750gb(ST3750640A-RK) and using one of owc regular enclosures(OWCMEFW912UAL1K). This would be about $400 for 750gb standalone. Are the perpendicular 750gb really anything special? I know hey have increased storage, but are they really faster and more reliable as well? Would that be a better drive choice than the 400gb? Does the raid setup have any distinct advantages or disadvantages, or vice versa? With the raid setup I at least have a little versatility if I ever need. Which would you recommend? Thanks.