So after using mine for a few days and installing a few more apps and whatnot I'm down to around 5.2GB of space on my C: drive. I have not yet done the trick to get Metro apps to install on the SD card, seems like a pain to me. I can move the recovery partition to a USB stick and get back around 4.5GB of space. I also can't seem to get Skydrive to use the SD card either, I always get an error saying it can't be indexed...
I'm contemplating exchanging the 32GB model for a 64GB model instead just to get the extra space.