i third the m4.
what i'm about to type is not unique to me, you'll find my experience is quite common.
my HTPC was running on an OCZ, it boot up in 35 seconds. after my 3 other OCZ drives failed i lost faith in it and cloned it over to an m4, my HTPC still boots up in 35 seconds.
i've owned 14 SSDs from 4 manufacturers. the ONLY ones that failed or didn't come close to their advertised speeds were all OCZ. only 1 of the 4 OCZ drives i bought still works, the one from the HTPC (at least i think it still works, i don't trust it, it's sitting on my desk used as a paperweight, literally).