1TB RAID 0 (2x 500GB SATA 3B/s 7,200 RPM) or mSATA caching SSD + 500GB 7200 RPM

I went with the latter configuration on my m17x but realized that most people on these forums went with the RAID 0 configuration. I main reason I passed on the RAID 0 was because I read that it doubles the chance of hard drive failure, and because I wanted to keep my boot drive separate from the other drive. Which one would offer a better peformance, the 1TB RAID 0 (2x 500GB SATA 3B/s 7,200 RPM hard drives) or mSATA caching SSD + 500GB 7200 RPM hard drive?

 

I think going for the latter makes more sense if you're planning to buy and install an SSD in the future to use as your primary/boot drive.
If you opt for the RAID configuration, however, you will have to give up the raid configuration since you're going to be removing at least one of your RAID-configuerd-drives, whereas mSSD and real SSD can work together, afaik.
Hope I'm not mistaken on this tho.
The big guns here should know better I think

 

He is right. If you plan to add an SSD later just take the 500GB with msata. If you just need performance and don't mind about losing files or have an external HDD you can get the RAID.