^+1 Agree.
2 x X25-V = 1 x X25M.
A "V" model is (pretty close to) a "M" model in half: half the size, half the speed. Compare the specs.
Although my rig has 2 x X25-V in RAID 0, I wouldn't recommend it.
1) Loss of TRIM
2) Loss of capacity, in order to "work around" the loss of TRIM.
It is/was recommended to only use 80-85% of the full RAID size, leaving 20-15% unallocated and unformatted, for the drive to use the space to "self-optimize."
Hence, my 80GB RAID drive only uses 64GB of space. This isn't an issue with me, as my OS drive only uses 22+GB of space; Windows 7 Home Premium, Office 2007 Enterprise, Quicken 2010, iTunes 10, Norton Security Suite (from Comcast) are the largest programs installed.
Here is some information overkill:
RAID - Wikipedia, ...
BTW: You would want RAID 0 for "speed."