Above you'll see my Runcore 64GB SSD drive sitting in front of my Dell Mini 9. The Runcore cost me $220—just $30 less than I paid for my Mini 9.
Now Dell is selling its business black version of the Mini 9, the Vostro A90, for just $200. Slap in a bigger SSD (the Runcore tends to benchmark the fastest, but I only went with 64GB because the 32GB were in deep backorder) and 2GB of RAM, and you've got yourself a fine little Hackintosh for around $500. And you can do it for far less if you go with a more modest SSD.
One bonus to the Runcore, though, of any size: Along with snappy performance, the Runcores come with a micro-USB port, making it possible to plug it in to your Mac, boot from any install disk (even the crippled ones that come with your Mac), and install OS X directly onto the SSD. Put it in the Mini 9, boot from a Linux sysloader on a USB flash drive, and run the DellEFI driver installer once you're in OS X. Easy peasy. It took me about three hours to do it—two of which were spent mucking around trying to get OS X to boot with the flash drive because I tried to get fancy with newer versions and didn't use the one suggested in the instructions.