Instead of @disqus, I'm thinking of creating @reddit posts for each comment-worthy entry and linking that in the text
I think @disqus is worth paying for, but I will probably stop using it anyway. If you can handle the spam, straight WordPress is probably the best way to do comments. They are native to your platform. Native comments are too hard for most blogs.
More on the 27-inch iMac 2011: Adding memory is fairly easy. I stuffed it with 20 GB awhile ago. Swapping the hard drive is a shit show. You have to REMOVE THE SCREEN. #KillMe