Heh that sounds just like my situation about 9 months ago! I had a 2 year old male cat, and my mom's friend had a pregnant kitty. Well I definitely wanted one of the litter, and my mom said yes. Now, the sex of your new kitten will depend on the temperment and territorialness of teh cat you ahve now. My cat elliot is a very territorial boy even though he is fixed. He does not like my mom's old male cat Rosco all that much, so they basically just stay away from each other. BUt I know that elliot liked female cats, so I took a female kitten. SO it really depends on your cat. It oculd be territorial like mine, and in that case if you have a male get a female, and if you have a female, get a female. Again about the "will my cats ignore me" part, it all depends on your cats. Your questions are kind of unanswerable that way O_O. I don't think you can get ignored by your cats. Soon they will be bored with one another and theyll say " Hey! I remember that human thingy that feeds me and buys me toys! I want to be petted" Because no matter how much fun they have playing, cats just arent good at petting xD. Also the reaction of your cat to your kitten also depends on the cat. But eventually they should start getting along and should lurve each other :O
My cats lurve each other ^_^
Oh, and if you have a female and get a male, or a male and get a female, I would hope that you would at least get the females fixed! I know it sounds kind of bad, but if you dont have alot of money its better to have a cat taht makes the babies instead of one that grows them!