It's interesting how one of the reasons doge was picked was because of its low difficulty. Yet other then bitcoin and litecoin, it has the highest difficulty.
Understandable though considering dont know of many coins other then bitcoin, litecoin, and now dogecoin
Author here. Yes, at the time of writing the blog post, I really did not know much about mining difficulty, or how dogecoin's difficulty matched with other scrypt-based currencies.
I should probably update the post a bit!
I would have also considered Primecoin. It's another cryptocurrency, but the unique thing about it is that as of now it can only be mined using CPU. I myself have tried mining it with Amazon EC2, but only using the free trial (which gets me ~$0.30/day I believe). I have no idea how it would work out with a larger instance on a paid plan, but looking at the performace/price I got with some other trials of cloud services (like Azure and Digital Ocean), I don't believe that mining it (or any cryptocurrency really) is profitable on a cloud computing platform.