Why RAID-anything in a laptop? A single Intel SSD is pretty darn fast, and the second bay is more useful as a large-capacity spinning hard drive (unless you need the optical drive, of course). I have my MBP set up this way and I've been very pleased with it.
For me at least: the single SSD got boring after a while and I wanted to get better speeds. As for storage I have a 2TB (RAID 0 as well) HTPC ( http://paulstamatiou.com/how-to-build-microsoft-windows-7-in... ) that keeps most of my media and usenet junk, then an external for other stuff.
