hehe
best litter boxes are the big ones that have hoods. I'll upload a picture. These ones help avoid litter getting on the surrounding floor and also help with the smell.
Personally, I would get more than one food bowl.. Just so they each have something to eat out of if they're hungry at the same time.
What do you plan on feeding them? If you get canned food (which you definitely should.. as well as dry food) you'll probably need can covers.. (I'll upload a picture of those too :P) They're for when you don't use up the whole can.. It keeps the food fresh.
You don't really need a water fountain.. I mean it's a cool thing but more of a novelty. I don't want to be misleading, if I had one it'd be awesome.. But if you just get a normal bowl you'll have more money for toys
I'd recommend a cat tree because you can get cat trees that have scratching posts on them already.
You can put the tree in your living room or hall, and also buy just a normal small scratching post to put in another room.. (in case they're in there and have the urge to scratch.)
One really really great thing you could get is catnip spray. I was always a little against the idea of catnip.. but the spray (at least with the one i have) only contains the part of catnip that attracts the cat, and not the part that drugs them
One really great toy I have for my kitties is a little toy mouse. I recommend the hard ones that don't have cotton in them, and are coated with a feather/fur like material.. They feel real and the cats usually get really serious about them xD.
You don't need a basket as well but there's no harm in getting one. I like the idea of one biggish bed so they can both cuddle together.. (I'm getting excited talking about cat things.. If I had the money I'd be buying all sorts of things..xD)
Another great toy is anything stick-like that has some sort of feathery thing at the end. If it has tinsel at the end that's fine but just be careful that your cat doesn't rip any off and eat it..
Hope I was a help.. Sorry for blabbing!