Damn. That's dropping some serious cash. You could buy a nice NAS or some thunderbolt enabled raid storage and get a lot more space.
If you don't need that 1 TB to be portable, why not get this?
Once third party SSD options are available Apple will change the connecters on the next rev. of their SSD for their laptop. Mac air 2011 SSD is not the same as 2012 SSD I don't think Apple wants anyone to mess with the inside of their computers.