Have you solved the M400+SSD V200 issue?!
I'm also looking to intall an SSD into my M400 and I've seen Kingston V200 at a good price; but I think this config is a no go. Because, from what I read, M400 has the first SATA interface (SATA I - 1.5G) and Kingston V200 is SATA3, backward compatible with SATA2; but would not work in SATA1.
Finally I decided to buy a SATA2 SSD (OCZ Octane) because SATA2 is backward compatible to SATA1 (I did not install Win7 on the SSD, yet).
I did install Win7 from scratch/boot (not upgrade) on an empty HD but it required the RAID drivers from Toshiba. I put them on an USB that was recognized by Win7 while installing.