Just a thought about litter disposal. I have four cats and five litter boxes. What works for me is using a diaper pail to put dirty litter into. Works great and I don't have to dump it into the "main" trash can every day. It's also easy to clean - take bag out and dump, then place dirty diaper...
You may have already gotten your second cat and I certainly don't want to discourage you, especially since so many cats need homes, but just be aware that this will complicate your life somewhat (as well as add extra joy, of course!). The issue of having them eat from separate food bowls isn't a...