RAID 1 is pretty much identical to a single drive, with the main drawback being that you're using 2 drives, but only getting one drive's worth of capacity. RAID 0 on the other hand, is pretty highly overrated outside of certain applications (A/V, large file handling, etc). Personally, I'm not sure I've seen anything happen 75% faster on my own system.
__________________ QX9650 @ 4.038GHz (425x9.5) | Asus Formula Maximus | GTX280 (777/1620/1404) | Mushkin XP2-8000 Redline 2x2GB
Q6600 @ 3.6GHz (400x9) | MSI P35 Platinum | 8800GTS 640MB (700/900) | Mushkin EM2-6400 2x2GB
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