A quick note about the water fountains. We use Fresh Step litter for our kitties, and there's Paw Points on the packages. You get free stuff when you save up enough of them. One of the things you can order is an electric cat fountain, so we got one for our cat that used to drink out of the bathtub faucet and he loves it.
I'm guessing the Feline Leukemia test was negative? When we found our own "road kitten," SheiKra (some jerk tossed him into traffic on the expressway), I was scared to death the test would be positive but thankfully it wasn't and he's been our spoiled boy for three years now.
Hopefully you'll be able to leave the leg as-is. One of my previous cats that I got from the shelter had a misshapen leg that the vet said was from a previous break. It apparently healed on its own, and he lived to be 16 with no problems from it.
Besides claw caps, put double sided tape where you don't want your kitty to scratch and offer more than one scratching post. That's how I keep my furniture intact (well, mostly) with four cats.