RAID 0 with 2 good SSDs is insanely fast as it can boost read speed to near 300MB/s range and write speed into the 200's MB/s.
RAID 0 isnt exactly unstable though, your basically doubling the chances of losing your data due to a hard drive failure. but since the odds of a quality ssd failing should be pretty low, i say go for it. RAID 0 with 2 500gb hard drives can be plenty fast, im sure that will be even better.
Loading Windows on your RAID 0 raises the rate it will crash, I was referring to software problems. In RAID 0 if Windows crashes and your array corrupts there goes all of your data.