My little one's BFF is a chi! They are almost exactly the same size, and they run around and play together for hours until they crash out and nap together on the same blanket. There is a picture of the two of them in my photo album
The chihuahua is my current roommate's dog and I dread the thought of separating them when I move. If I were to get another dog, I'd definitely consider a chi. Their coats are definitely pretty maintenance-free, especially compared to a Yorkie!