It's A. vera I'm after. I actually have that exact aloe on my windowsill! A friend of mine is looking to extract the skincare stuff from vera, she bought seeds from ebay and spent the next few months looking lovingly after something that strongly resembles a potato plant before sending me a picture and asking my advice. After enjoying that for a long minute or two, I thought I'd try to help her out.
Its because of the large variety of aloes that I'm asking, really, I want to find a good supplier that won't just call some random aloe "aloe vera".