Kind of disappointing to see Apple release this now, nearly 6 months after putting the redesigned iMac on sale. The SSD only option on the 21.5", along with some of the other design miscues (in my opinion) dissuaded me from buying the redesigned iMac, and instead bought a mid-2010 that I performed my own SSD surgery on.
Furthermore, with the popularity of SSD's gaining by the day, it'd be nice to see Apple offer the option of either a 128GB SSD or 1TB HD as the base storage. I've found I get by just fine with that size SSD as my internal and keeps performance snappy, and I keep music, photos, and just a couple of movies on an external hard drive. They're pretty close in price for us consumers, so the assumption here is that the wholesale cost is pretty much the same for an OEM like Apple.