Have you thought of adopting instead of going to a breeder? There are so many kittens that need homes. I'm not trying to bash, but sometimes people don't realize that there are so many kittens/cats in need of homes that are sitting in shelters - some even in KILL shelters (which means they are euthanized once their time is up due to lack of space, etc)
Aside from that, getting two kittens together is highly recommended by me!! I am a foster mom and my last batch of kittens I adopted out 2 pairs of kittens, it is always so amazing to see how awesome they are with one another. It's a special kind of relationship & it's always so cool to know that they'll always have one another. They keep eachother company and always have someone to cuddle with and love on, but that DOESN'T mean they won't want you for cuddles and love, too. Plus it's awesome to see their two different personalities.
Litter boxes vary... I have 6 cats and only have 4 boxes, because honestly, theres not many more places to put litter boxes, I already have two in my dining room - which was a big no no when we first moved in. I hated the idea of that, but it's worked out fine, now that I've gotten over it! But anyways, I have 4 boxes, all my cats use them just fine as long as they're kept clean. I have a litter genie, and I will scoop 2 to 3 times a day along with scooping everytime I see one go in them! It's a full time job around here, but I love it this way.
I am a strong believer in saying that every single cat is different whether its a female or a male, I used to always believe that female cats were more solitary/independant but I have one female(Ramona) who is a little more independent in what she does people wise but loves to be around the other cats, she's always getting into trouble with Boogey or Sampson, and then I have one female (Sophie) who would prefer to always be with us people instead of the other cats.. aside from her littermate Boogey.
Danielle & the seven meowzers.
Eechy, Boogeyman, Sophie, Ramona, Luigi, Sampson & Henry.