I have one orange tabby and one calico - and they are both super affectionate. The calico is beyond affectionate, actually - I wake up to her smooches and scarf-imitations most mornings. And the orangey is a lap kitty too - loves to nap with you, and sleeps on the bed all night, and keeps you company while you pee... hehe.
Frankly - go to the store/shelter/farm/etc. Sit down and make yourself available. If the kittens walk right up and investigate you, and let you scritch them/purr at you, that's your cat. You want them to be all up in your grill with curiosity.
And yeah... get two. It's okay for an apartment (I have an apt too), and they'll socialize each other, keep each other company, and you won't have to feel guilty about leaving the little thing home ALONE for several hours at a time. Oh, and they won't keep you up at night so much. (They will a bit in the beginning, since they're kittens.)
And when you get them - to keep them easily taken care of and affectionate - play with them thoroughly. Pick them up as much as you want. Let them know they can trust you. Play with their paws and their bellies. Get them used to you in their personal space - that way, clipping their claws is easy, if you ever need to treat them medically, it's easier, etc.
Hope that helps.
